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You can check the location of your Outlook Data Fix Outlook Not Opening After Windows Update Files in Outlook.

Repair Outlook Data Files (.pst and .ost)

This is all most people will need, searching for older items will be slower but for daily use items it will still be quick. As you close them, lead to the folder and right-click on the OST file. Once you re-open Outlook, your OST file is automatically recreated or rebuilt. If your hard drive goes through any physical damage, it will damage the data across it too. A bad sector or corrupted hard drive can cause OST inaccessibility.

Outlook - OST file recurring corruption

Although the repair process might recreate some of the folders, they may be empty. The Outlook Stuck on Synchronizing Folders Lost and Found folder contains any folders and items recovered by the repair tool that Outlook can’t place in their original structure. You can&nbsp