Thus, it requires a systematic approach to recreate OST file and avoid a data loss situation.Īn instant solution is to use a reliable OST to PST converter software, such as Stellar Converter for OST. As a result, synchronization stops and Outlook displays error messages.Īlthough this can be fixed by recreating or rebuilding a new OST file, it often results in missing mail items and data loss as some items may not have synchronized with the mailbox on the email server. When OST becomes inaccessible, Outlook stops working as it can’t access or read the OST file. However, the OST file is prone to damage due to various events, such as system crash. The OST file synchronizes the changes with the mail server once the internet connection is restored. When Outlook is set up using an Exchange,, Office 365 or IMAP account, it creates an Offline OST file that allows you to access Outlook and make changes even when the system is offline.

Offline Folder or OST is an Outlook data file used to store a local synchronized copy of mailbox items, such as emails, contacts, attachments, calendars etc.

We’ve also mentioned an OST to PST converter tool that can help restore missing emails from inaccessible OST files. In this blog, we’ve discussed steps to recreate OST files in Microsoft 2019, 2016, 2013, and 2010 with complete integrity. By recreating the OST file, Outlook users can fix the errors, such as OST is not an Outlook data file. Outlook users need to rebuild or recreate OST file to fix OST file-related errors that appear when their current OST file gets damaged or becomes inaccessible.

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