Summary: An OST viewer software helps view and read Outlook OST files that are in inaccessible or orphaned state and can’t be accessed via Outlook. In this post, we’ve discussed top 5 free OST viewer Software that allows you to view, read, and convert mailbox items in OST file to Outlook PST format.
OST is encrypted by default with MAPIEntryID GUID. Thus, OST is bound to the MAPI profile and requires authentication to access the mailbox data stored in it. But if the OST file gets damaged due to Outlook crash or other system errors, it may become inaccessible. Further, if the MAPI profile is deleted or removed from the mail server, the Outlook OST enters into an orphaned state and can’t be accessed from any Outlook profile.
However, you can view any OST file, including orphaned and inaccessible OST file, by using an OST viewer tool. The software allows you to view and extract mailbox items stored in Outlook OST data files without authentication. The tool also helps you get back access to mailbox items stored in inaccessible, damaged, or orphaned OST files.
Below we have discussed 5 free OST viewer tools that you can download on your Windows PC to scan and read OST file without any size limit.
Stellar Viewer for OST is an easy-to-use free OST viewer software that comes from Stellar®, one of the most reliable and trusted data care brands in the world. The software enables you to search, scan, and preview mailbox items stored in an OST file. It also provides search options and filters, such as the ‘subject line’, ‘From’, ‘To’, ‘CC’, ‘BCC’, to locate and view specific emails or mail items. Further, it also allows users to save or export the mailbox items to EML, RTF, MSG, PDF, or HTML formats.
With the help of Stellar Viewer for OST, you can also view, read, and convert an inaccessible or orphaned OST file without authentication.
Written in C#, the Xst Reader is an open-source and free OST viewer software that allows you to view and read both OST and PST Outlook data files. It requires .NET framework 4 to run. However, it can open and preview the OST file without Outlook installation.
Xst Reader scans the OST file and displays all mail contents in a three-pane window. It previews all mailbox contents and properties. Further, you can export the emails from OST file to HTML, Plain Text, or Rich Text Format (RTF).
Stellar Converter for OST is another software from Stellar® that can be used to view OST files. It’s a powerful OST to PST converter software that scans, previews, and converts OST files to PST format. Besides PST, you can also use the software to export mail items from an inaccessible or orphaned OST file to an existing Outlook profile, live Exchange, or Office 365 account.
You can also use the software to backup OST mail items in PST format and then open or import the PST in any Outlook account to access or view mailbox items.
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.
Aryson OST Viewer is another free OST viewer software that allows you to open and view OST file contents without Outlook. The software helps you preview emails and other mail items from any OST file, irrespective of file size. It can also open encrypted or password protected OST file without any issue.
In this post, we’ve discussed top 5 free OST viewer software that you can download to view and read a healthy, orphaned, or inaccessible OST file. Some of these OST viewer tools lets you save the OST data to various formats, such as PST, EML, MSG, RTF, HTML, and PDF or existing Outlook profile, live Exchange, and Office 365 account.
Based on your requirement, you can choose and download any of the listed OST viewer software to open, view, convert, or export OST files. In case you need any help in choosing the best free OST viewer software or want to know something specific about the free OST viewer tool, reach us via comments down below.
Ravi Singh is a Senior Writer at Stellar®. He is an expert Tech Explainer, IoT enthusiast, and a passionate nerd with over 6 years of experience in technical writing. He writes about Data Recovery, File Repair, Email Migration, Linux, Windows, Mac, and DIY Tech. Ravi spends most of his weekends working with IoT devices and playing games on the Xbox. He is also a solo traveler who loves hiking and exploring new trails.