Open or import items from an offline Outlook Data File (.ost)
https://support.microsoft.com/en-us/office/open-or-import-items-from-an-offline-outlook-data-file-ost-a584963e-a66d-4d9d-8845-31cb270f6880
WebRe-create an offline Outlook Data File (.ost) Exit Outlook. In Control Panel, click or double-click Mail. Where is Mail in Control Panel? 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, ...
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