However, new sub-folders (created after sharing rights were set) inherit the folder access permissions of the parent folder. Note: Items in any existing sub-folders of the folder you share are not available to the person unless you change the sharing permissions on each sub-folder. You specify which folder, and the level of access, that is, whether the delegate can simply see items in a folder, or whether they can create, edit, and/or delete items. Recreate OST File by Moving or Deleting the Inaccessible OST File.Recreate OST File by Changing the File Extension.Recreate Offline Data File (OST) in Outlook 2019, 2016, 2013, and 2010.Reasons Behind Inaccessible, Orphaned, or Damaged OST File.Sharing lets you give others access to your mail folders. 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. 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. The OST file synchronizes the changes with the mail server once the internet connection is restored. However, the OST file is prone to damage due to various events, such as system crash.

When OST becomes inaccessible, Outlook stops working as it can’t access or read the OST file.

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.

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