Jun 17, 2020 ... How To Change OST File Location of an OST file so you don't run out of space on you're C Drive. Click "Export to a File," choose "Next," select "Outlook Data File (.pst)" from the list of file formats, and then click "Next." 4. Select your email address or choose the folder you want to ... Outlook 2010 continued to open, read, and write to this .ost file without issue after the Exchange server mailbox was deleted, and allowed me to file emails from my new account in the same folder structure. With a warning message, I could have exported all records to a .pst file from Outlook 2010 before installing Outlook 2016.In this way, you can access the email from the orphan OST file on the new computer. Transfer Multiple OST File: This tool offers an option to Add a Folder of .ost files and transfer them to another system. By adding multiple offline data file, you can open OST file on another computer in bulk that too in a single attempt.Working of SysInspire OST to PST Converter:-After launching the tool in first screen tap on select OST file button.; Choose the OST file of which data you like to import into Office 365.; After selection you can see all the folder stored on OST file choose them and hit on Export to Office 365 button.These methods will allow you to access OST files created by any Outlook version. Reasons to Open OST File Without Outlook. Several scenarios may require you to open and view the OST files without Outlook, such as: No access to Microsoft Outlook; OST file is copied or imported from another Outlook or system; Verify or check the mail items in the ...Jun 15, 2022 · This how-to guide will help you understand how to open another user OST file in Outlook. Here we will unravel all the methods to import orphaned OST files into Outlook 365, 2019, 2016, 2013, and 2010. OST file is a synchronized duplicate file of the complete data residing in the IMAP/Exchange server mailbox. It is generated with embedded encryption in response to the IMAP profile configuration ... View OST online Open and view OST files online with free OST viewer. Powered by groupdocs.com and groupdocs.cloud.1. I am currently trying to parse a .ost file into individual items & emails. I have used libpst to accomplish this for .pst files however this doesn't seem to support .ost's. My operating system is Ubuntu Server 16.04. Any and all suggestions are very welcome!!! For pst files: sudo readpst -o -D -j 4 -r -u -w -m.Jun 26, 2022 ... Comments6 ; How to Import an OST File in Microsoft Outlook : Tips for Microsoft Office & Windows. eHowTech · 299K views ; Change Outlook Data File ...However, if the exchange is not available it becomes impossible to access an Outlook data file. How to Open OST File in MS Outlook without MS Exchange Server? Method 1: Use Third-Party OST to PST Conversion Tool. One of the easiest ways to open a corrupt OST file in Outlook is by using a third-party tool to convert OST into PST file format ...You can use the Internet to find the latest news that affects your business, read interesting tips and learn new tricks that help you grow your business. You can also download thou...Tax season can be a stressful time for many people, especially those who are filing taxes for the first time. Fortunately, H&R Block offers a free online filing service that makes ...Dec 10, 2020 ... How to Import an OST File in Microsoft Outlook. Part of the series: Tips for Microsoft Office & Windows. Importing an OST file in Microsoft ...Again, you can either create a new OST file or select an existing one. Click on "Browse" and navigate to the location where your OST file is saved. Select the OST file and click "Open". Click "OK", and then "Next", and finally "Finish". Note: It is important to remember that OST files are linked to the email account they are created with.Make utilization of the Free OST to PST Converter Software that safely attempts to recuperate information from OST record and transformation of viewpoint OST document contacts, calendar, images, notes, attachments etc and other users mailboxes data. With utilizing this OST File Recovery Software you can change over OST record as PST as …Phase 1: Convert OST to PST. Firstly, open the Outlook. Now, from file Menu>> Import & Export >> Import/Export. Go with the Export to a File option and select PST file as saving type. Here, select ...We would like to show you a description here but the site won’t allow us.Reduce your mailbox size. Reduce the size of an Outlook Data File (.pst) or Offline Outlook Data File (.ost) Learn how to find out the size of your mailbox and its folders and how to …1. Open Microsoft Outlook, click on the OST file and choose “Archive”. 2. In the dialog box that appears, choose the file or folder that you would like to archive. 3. Browse the required destination to store archived Outlook PST file. 4. Now press “ok” for the process to commence.Outlook Data Files (.ost) are always copies of items that are saved on a mail server and don’t need to be backed up like Outlook Data Files (.pst). Re-create an offline Outlook Data File (.ost) Offline Outlook Data Files (.ost) are copies of your Exchange information. It is not necessary to back up this file. You can create a new copy at any ...We would like to show you a description here but the site won’t allow us. Two ways to get that info - both arrive at the same place. From within Outlook, go to. File --> Account Settings --> Data Files tab --> look for the file that is shown in the message. The full path to that file is shown there. Using the Control Panel <Mail> app. Click on the Data Files Button. The default location for .ost data files is. OST2PST Set creates PST files that can be opened offline. How to open ost files in Outlook. OST2PST Set is the easiest way to open .ost files in Outlook. It converts the data into clean .pst files, which are accessible offline. This application is free to try. Once you decide to get this tool, the conversion of .ost files can be done in minutes ...Xst Reader is an open source viewer for Microsoft Outlook’s .ost and .pst files, written entirely in C#. To download an executable of the current version, go to the releases tab. - Releases · Dijji/XstReaderPrior to anything I renamed the ost files (one file was corrupted and the other was created as a backup) then went on to add a new location for the ost file by going to Control Panel - User Accounts - Mail Setup - Data Files. (POP) Made a new default data file but did not delete the original data file. By doing so, I was now able to open Outlook.Open Microsoft Outlook 2016. Click on the “File” tab in the top left corner of the Outlook window. Click on ‘Open & Export’ and select ‘Import/ Export’ from the options. Click on the “Export a File” option and Click Next. Select the “Outlook PST option” or “CSV” option and click on Next. Now you can select the folders to ...Dear Ismael, Good day! Thank you for posting to Microsoft Community. We are glad to assist. As per your mentioned description about "How can I Import .pst/.ost file in Outlook 365 online" After thorough research and testing, it has been concluded that the feature you are inquiring about is not yet available in Outlook on web.When a user wants to Open an OST file then he can do so using MS Outlook and access all the emails and activities. But the problem arises when a user has to open OST file without Outlook. In such a scenario, you can try the OST File Viewer and view OST file data without MS Outlook Installation. So, in this article, we would cover the method...Learn how to access OST files without Outlook using free tools such as Xst Reader and third-party OST viewers. Find out the reasons, methods and precautions …Until Microsoft Outlook 2013, PST files were also used for IMAP or MAPI accounts. However, starting with Outlook 2016, the client stores all your emails and appointments from IMAP and MAPI accounts in an Offline Storage Table (.ost) file. OST files automatically synchronize with the email server, as long as you have an internet connection ...Click on Open >> Email Data Files >> Outlook PST/OST Files. Browse & upload the OST file to the software preview panel. Preview MS Outlook data in 4+modes & click on Export button.That one url is filled with a lot of spam from companies that sell ost recovery tools. While it's what you will probably need to use (unless the profile that created the ost is still available), I have a list of all ost recovery tools listed here: Convert an Exchange Offline file (OST) to a Personal Folders file (PST)When a user wants to Open an OST file then he can do so using MS Outlook and access all the emails and activities. But the problem arises when a user has to open OST file without Outlook. In such a scenario, you can try the OST File Viewer and view OST file data without MS Outlook Installation. So, in this article, we would cover the method...Click Data Files, followed by Open File Location to reveal the OST directory via File Explorer. Open the OST File Location Through the Control Panel’s Mail; Reduce the Size of the OST Files. Large OST files (over 50GB) may require size reduction due to synchronization issues: Limit cache duration between 3 to 6 months to prevent excessive ...anuraag-systools (Anuraag (SysTools)) June 15, 2022, 5:18am 1. This how-to guide will help you understand how to open another user OST file in Outlook. Here …Step 3: Add an Outlook Data File (.ost) to Outlook 365. Launch Outlook 365: Open Microsoft Outlook 365 on your computer. Go to File: Click on the “File” tab located in the top-left corner of the Outlook window.CSV file is standard and easy to open via Microsoft Excel. Open an OST file in CSV to transfer emails from the Outlook mailbox to the Excel spreadsheet. Above mentioned points assure the users have to convert their OST files to CSV format. Now, let’s begin with the possible ways to convert an OST to CSV for free.1. I am currently trying to parse a .ost file into individual items & emails. I have used libpst to accomplish this for .pst files however this doesn't seem to support .ost's. My operating system is Ubuntu Server 16.04. Any and all suggestions are very welcome!!! For pst files: sudo readpst -o -D -j 4 -r -u -w -m. Simplify the process of viewing inaccessible, damaged, or corrupted OST files in just a few steps: Start the software, click the Browse button to select a single or multiple OST file (s), and click Next to proceed. Review the process information and click " Finish ." In the next step, click on the files you want to view. Open OST File in Outlook: Outlook 2010 and upper versions such as Outlook 2016, 2013 & 2019 are not supportive of manual methods for importing OST files. In such a situation, re-create an OST file via manual steps, and after that, it will become comfortable for you to access the items with Outlook. Steps to re-create the OST file in Outlook are ...Open Outlook and navigate to the File tab. Head to Account Settings > Account Settings… Hit that Data Files tab with gusto. Click on Add…, choose Outlook …While it's what you will probably need to use (unless the profile that created the ost is still available), I have a list of all ost recovery tools listed here: Convert an Exchange Offline file (OST) to a Personal Folders file (PST) You can judge for yourself which to use, rather than seeing only what the spammers posted. :) My specialty is ...1. Open Microsoft Outlook, click on the OST file and choose “Archive”. 2. In the dialog box that appears, choose the file or folder that you would like to archive. 3. Browse the required destination to store archived Outlook PST file. 4. Now press “ok” for the process to commence.Steps to Open Converted OST File in Outlook 2019, 2016, 2013, and Older Versions. If you have converted an OST file to PST format, you can easily open it in any version of Outlook, as PST files are compatible across all versions. Here are the steps to open a converted OST file (now in PST format) in Outlook 2019, 2016, 2013, and older versions: 1.Celsius Network, one of the world’s largest cryptocurrency lenders, has filed for bankruptcy protection, a month after freezing customer assets. Celsius Network, one of the world’s...Provide live email preview of OST file before starting the converison of OST file. Supports to convert big sized OST file without any issue. You will not see any modification in OST file all the email formatting and folder structures remain intact even after the conversion. Conclusion. Because of various drawbacks of the manual method the best ...How to open OST files. You need a suitable software like Outlook to open an OST file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert.If you cannot open your OST file correctly, try to right-click or long-press the file.Step 3: Add an Outlook Data File (.ost) to Outlook 365. Launch Outlook 365: Open Microsoft Outlook 365 on your computer. Go to File: Click on the “File” tab located in the top-left corner of the Outlook window.Feb 12, 2016 ... How to open ost file in Outlook. 49K views · 8 years ago ...more. Sagar S. 67.2K. Subscribe. 34. Share. Save.Outlook Data Files (.ost) are always copies of items that are saved on a mail server and don’t need to be backed up like Outlook Data Files (.pst). Re-create an offline Outlook Data File (.ost) Offline Outlook Data Files (.ost) are copies of your Exchange information. It is not necessary to back up this file. You can create a new copy at any ...Feb 23, 2022 · Outlook will automatically access this file if your Internet connection cuts out. You cannot open the OST file directly. However, if you have several OST files, you can define which file Outlook to use. Phase 1: Convert OST to PST. Firstly, open the Outlook. Now, from file Menu>> Import & Export >> Import/Export. Go with the Export to a File option and select PST file as saving type. Here, select ...Steps to Open Converted OST File in Outlook 2019, 2016, 2013, and Older Versions. If you have converted an OST file to PST format, you can easily open it in any version of Outlook, as PST files are compatible across all versions. Here are the steps to open a converted OST file (now in PST format) in Outlook 2019, 2016, 2013, and older versions: 1.You will need a converter like this one How to Open OST File in Outlook 2019, 2016, 2013, 2010, 2007? (stellarinfo.com) This is a non-Microsoft Web site. The site ... If you use an Microsoft 365, Exchange, IMAP, or Outlook.com account, a copy of your mailbox is stored in an Offline Outlook Data File (.ost). To reduce the size of your Outlook Data File (.pst) or Offline Outlook Data File (.ost), you can manually compact the data file. Select your version of Outlook below to see instructions on how to reduce ... To select a different existing profile, click Show Profiles, select the profile name, and then click Properties. On the E-mail tab, select the Exchange account, and then click Change. Clear the Use Cached Exchange Mode check box. Click More Settings. On the Advanced tab, click Offline Folder File Settings. Click Disable Offline Use, and then in ...How to Import an OST File in Microsoft Outlook. Part of the series: Tips for Microsoft Office & Windows. Importing an OST file in Microsoft Outlook will allo...Assuming that this actually has to do with the (an) OST file, the best way to deal with problematic ost files would be to take note of the actual OST folder path/file name --> with Outlook closed, rename the file --> restart Outlook which will recreate the OST file and resync with the server.Also Read:- How to Open OST file without Outlook. Users Can’t Open OST Files Without Exchange Account for a Few Reasons. Outlook creates Outlook Offline Folder (.ost) file when a user configures their profile through Cached Exchange Mode. When users delete the Exchange server account this will also stop the OST file from functioning.Summary: This blog will highlight the most common query of the Tech community to open OST file in Outlook with or without Outlook installation. So, let’s dive into it. When it comes to email management, OST (Offline Storage Table) files are essential since they let users access their Outlook mailbox data offlBrowse to your desired file, select it, and voilà! You’ve added a PST file. Adding an OST File: Just a heads-up: OST files sync with the server, so they’re automatically created when setting up an Exchange or Office 365 account. Manual imports aren’t the norm for OST, but in a pickle, you can create a new account and let Outlook do its ...The process to open OST file in Outlook 365 doesn’t provide advanced options for proficient migration. Professional Way to Import OST Files to Outlook 365: As we all know, emails contain crucial ...Click Data Files, followed by Open File Location to reveal the OST directory via File Explorer. Open the OST File Location Through the Control Panel’s Mail; Reduce the Size of the OST Files. Large OST files (over 50GB) may require size reduction due to synchronization issues: Limit cache duration between 3 to 6 months to prevent excessive ... For some additional cost, it offers a good Outlook pst file converter if you need to save emails as PDF or DOC files. 2. Google GAMMO Tool. The Google GAMMO Tool. is an interesting way to open PST file without Outlook. Google developed this free tool to migrate your emails within a PST file to Gmail. anuraag-systools (Anuraag (SysTools)) June 15, 2022, 5:18am 1. This how-to guide will help you understand how to open another user OST file in Outlook. Here …In this video, you'll learn how to open an OST data file with and without Outlook. OST files are commonly used by Microsoft Outlook to store offline copies o...Summary: This article explains the best tools that are highly specialized to open OST file without MS Outlook on Windows.Here, we will describe the top 05 OST Viewer software that can easily open any OST file. Download Now Purchase Now. OST is an offline storage file in Microsoft Outlook that allows users to work offline through OST …This how-to guide will help you understand how to open another user OST file in Outlook. Here we will unravel all the methods to import orphaned OST files into Outlook 365, 2019, 2016, 2013, and 2010. OST file is a synchronized duplicate file of the complete data residing in the IMAP/Exchange server mailbox. It is generated with embedded encryption in response to the IMAP profile configuration ...We would like to show you a description here but the site won’t allow us.Outlook Data Files (.ost) are always copies of items that are saved on a mail server and don’t need to be backed up like Outlook Data Files (.pst). Re-create an offline Outlook Data File (.ost) Offline Outlook Data Files (.ost) are copies of your Exchange information. It is not necessary to back up this file. You can create a new copy at any ...Convert NST to PST and Open into Outlook. Locate the NST file in your PC. Make a Right-Click on it and then select Properties. Under the General tab Change the file extension from .nst to .ost. Once you change the File name, open Sysinfo OST to PST Converter. Add OST file into the software which you have renamed. All the data will be …anuraag-systools (Anuraag (SysTools)) June 15, 2022, 5:18am 1. This how-to guide will help you understand how to open another user OST file in Outlook. Here …Step 3: Click Data Files and open the OST file location. In the ‘Account Settings’ window, go to the ‘Data Files’ tab. Choose the OST file you want to open and click on the ‘Open File Location’ button, which opens the folder where the selected OST file is located.Yes, you can open your OST file in Outlook 2010 without any trouble. But before that, you need to convert from ost to pst file manually with the help of thescanpst.exe tool. This scanpst.exe tool is a default tool of Outlook 2010 even scanpst.exe can recover the corrupt OST file as well. If you unable to find scanpst.exe tool, follow this path:Outlook Data Files (.ost) are used when you have an Exchange account and want to work offline or use or use the default Cached Exchange Mode. This type of data file is also …Summary: This blog will highlight the most common query of the Tech community to open OST file in Outlook with or without Outlook installation. So, let’s dive into it. When it comes to email management, OST (Offline Storage Table) files are essential since they let users access their Outlook mailbox data offline. Scan and open corrupt, damaged, and inaccessible OST files to view complete Outlook mailbox content. The OST viewer opens emails with their complete body and attachments, along with contacts, calendars, meetings, appointments, drafts, sent items, deleted items, etc. 1. I am currently trying to parse a .ost file into individual items & emails. I hav
1040, W-2, 1099 — there are quite a few tax forms that most of us have heard of (or have had to file!) at least once in our lives. But for every familiar form you regularly submit,...Mar 15, 2012 · .ost is just a local cache, it's not meant for data retrieval, especially if your exchange account is removed from your machine or the account is deleted, so normally one would say "sorry" if you didn't export your mail to a .pst, backup file or similar and the exchange host does not have a backup copy for you. 1. Open OST data files with Outlook. Open Outlook and go to the File menu. Select Open & Export, then click on Open Outlook Data File. Navigate to the location of the OST file on your computer and …Also Read:- How to Open OST file without Outlook. Users Can’t Open OST Files Without Exchange Account for a Few Reasons. Outlook creates Outlook Offline Folder (.ost) file when a user configures their profile through Cached Exchange Mode. When users delete the Exchange server account this will also stop the OST file from functioning.Firstly, Launch Outlook and go to the File menu. Click on Data File Management. In the Data Files tab, click on Add. Navigate to the location of your OST file, select it, and click OK. Lastly, The OST file will be added to your Outlook profile. If you are still unable to open your OST file.Outlook uses OST file to download items from Exchange to local uses OST file for cached Exchange mode, however, all synced items won’t be saved to local once you remove the account: Cached Exchange Mode in Outlook 2016 for Windows. Introduction to Outlook Data Files (.pst and .ost) We generally suggest:Is there any method to open and import my .ost files? As original reply stated - there has never been an option to import an .ost file. The "Outlook Data File" you're referring to would be the default data file created with configuring an IMAP account in OL'2010 or earlier (if there was no default data file for the profile already) and it would ...To open OST files in Outlook 365 easily, I recommend using the safe and reliable MigrateEmails OST to PST Converter. This is an advanced tool that provides a smooth migration of multiple OST files to Office 365 without any accidental data loss. It also helps to convert OST to PST, PDF, MSG, MBOX, EML, etc. Apart from this, this tool also ...Summary: This article aims to provide straightforward methods to open OST files in Outlook.It will begin by introducing OST files and their significance. Furthermore, it will guide users in locating the OST file path. Additionally, practical steps for opening OST files in Outlook versions 2013, 2016, 2010, and 2007 will be explored.You will need a converter like this one How to Open OST File in Outlook 2019, 2016, 2013, 2010, 2007? (stellarinfo.com) This is a non-Microsoft Web site. The site ...An OST file is a data file created by Microsoft Outlook (2005 or later), an email client and personal information manager. It is used to store a copy of mailbox information from an Office 365, Exchange, or Outlook.com account. OST files may contain email messages, contacts, tasks, calendar data, and other account information.Open Outlook and sign in, if not already. In Outlook 2021, 2019, 2016, and 2013. Go to File > Open & Export > Open Outlook Data File. Browse and select the converted PST file and click ‘ OK ’ to open …It's always recommended to use the manual methods. There are mainly three manual methods available while working with an OST file. The first one is called Export, then the second one is Archive and the last one can be achieved by creating a New PST file. The step by step methods with the pictures can be found here in this Technet link.#ostfile #systools #outlookMicrosoft Outlook does not provide a direct method to relink an OST file, view an orphaned OST file, or import an OST file into Ou...Click on File >> Open & Export >> Import/Export window. Select Export to a File >> PST File and click Next. Select the required folders & browse the location to save data. Note: This method only works, when you have an Outlook profile. To read the orphan OST file, you can go with the automated solution mentioned above.Open OST File in Outlook: Outlook 2010 and upper versions such as Outlook 2016, 2013 & 2019 are not supportive of manual methods for importing OST files. In such a situation, re-create an OST file via manual steps, and after that, it will become comfortable for you to access the items with Outlook. Steps to re-create the OST file in Outlook are ...May 4, 2024 · Recovering Lost or Corrupted Files. Now let’s say you and your .ost file had a falling out. It got corrupted or you’ve deleted it by mistake—hey, we’ve all hit ‘delete’ when we meant ‘save.’ Don’t sweat it. Here’s how you can kiss and make up with those files: Recover Using SCANPST.EXE: A handy tool most Outlook versions ... Provide live email preview of OST file before starting the converison of OST file. Supports to convert big sized OST file without any issue. You will not see any modification in OST file all the email formatting and folder structures remain intact even after the conversion. Conclusion. Because of various drawbacks of the manual method the best ...To find recently downloaded files on your PC, click Start on the Windows tool bar, click on My Documents and then open the Downloads folder. The downloaded files are usually stored...Offline Outlook Data Files (.ost) are copies of your Exchange information. It is not necessary to back up this file. You can create a new copy at any time. Open or import items from an offline Outlook Data File (.ost)-When I run Outlook, I get a message saying it cannot open the ost file. I have done the following: 1. Ran scanpst.exe on file. Still cannot open. 2. When into settings/accounts/email accounts, then deleted and readded my … Simplify the process of viewing inaccessible, damaged, or corrupted OST files in just a few steps: Start the software, click the Browse button to select a single or multiple OST file (s), and click Next to proceed. Review the process information and click " Finish ." In the next step, click on the files you want to view. 4. SysTools OST Viewer. SysTools OST Viewer is a free OST viewer tool that lets you read and open orphaned, inaccessible, or corrupt OST file without Outlook. The software provides a free preview of OST mailbox data, such as emails, attachments, contacts, notes, calendars, etc. Image Source – SysTools..ost is just a local cache, it's not meant for data retrieval, especially if your exchange account is removed from your machine or the account is deleted, so normally one would say "sorry" if you didn't export your mail to a .pst, backup file or similar and the exchange host does not have a backup copy for you.1040, W-2, 1099 — there are quite a few tax forms that most of us have heard of (or have had to file!) at least once in our lives. But for every familiar form you regularly submit,...Nov 30, 2017 ... Have an error with your .ost file in Outlook 2016? You may need to compact or delete the OST file located on your local computer in order to ...Apr 13, 2023 · Follow the below steps to convert Outlook emails to PST file format. Start MS Outlook in your system. Click the File tab and select the Open & Export tab. Go to the Import and Export button ... Best method to know how to open OST file in Outlook 2019, 2016, 2013, 2010 / 07. This step-by-step guide helps to view or open OST file in Outlook or Outlook 365.The OST files that Outlook uses are created when a user chooses the "Use Offline Folders" option in the Outlook application. When this option is selected, the application stores the folders on the local hard drive instead of on the actual mail server that the application would usually download the files from. These files are then saved with the ...Subscribe Now:http://www.youtube.com/subscription_center?add_user=ehowtechWatch More:http://www.youtube.com/ehowtechImporting an OST file in Microsoft Outloo... Finally, Outlook OST files started to Move into PST data files. Once the OST files are migrated to the PST file you can make amendments to it by entering the passcode that is used by you to lock the files. Also please refer to: Open or import items from an offline Outlook Data File (.ost) (microsoft.com). Hope that this answers your concern. To Import the OST file into the Outlook, you need same outlook account. If you dont have same account then you can not import it to Outlook. Here, I would like to recommend for Stellar Converter for OST Technician -The powerful tool allows for directly importing the Outlook OST file data in the Outlook, O365, and Live exchange even the associated account is not available, only required to add ...4. SysTools OST Viewer. SysTools OST Viewer is a free OST viewer tool that lets you read and open orphaned, inaccessible, or corrupt OST file without Outlook. The software provides a free preview of OST mailbox data, such as emails, attachments, contacts, notes, calendars, etc. Image Source – SysTools.Outlook will automatically access this file if your Internet connection cuts out. You cannot open the OST file directly. However, if you have several OST files, you can define which file Outlook to use.Nov 30, 2017 ... Have an error with your .ost file in Outlook 2016? You may need to compact or delete the OST file located on your local computer in order to ... 4. SysTools OST Viewer. SysTools OST Viewer is a free OST viewer tool that lets you read and open orphaned,