How to fix when unable to access Outlook data files?
Try the following methods for fixing the Outlook data file cannot be accessed problem:
1) Disable Outlook's compatibility mode.
2) Remove invalid Outlook Add-ins
3) Switch off your account’s Cached Mode
4) Repair the OST file using Scanost.exe
5) Fix the Outlook application installed in your system
6) Change the damaged OST File to a different Format (such as PST)
https://www.limksys.com/outloo....k-data-file-cannot-b