Microsoft Outlook uses two file types for holding message, calendar, task and notes data: PST and OST files. PST files are created in the user's computer for non-Microsoft Exchange accounts ...

File > Options > Add-ins. Select COM Add-ins from the bottom drop-down menu, and click the Go button. Once you have done the needful, close the Outlook window and try to open it normally.

Use the Inbox Repair tool or disable add-ons to recover your .PST and .OST files in Microsoft Outlook Classic and New ...