Windows 10: Outlook does not work after update and I cant change the file type is now AU Format Sound

HiMy Outlook Classic does not work after my Microsoft 365 subscription was renewed last week. I have tried SCANPST and the repair steps -with no success. SCANPST said there were 101 errors which it repaired but I get the same error messages when I try to open Outlook Classic.In addition - somehow the file type of my pst file is now changed to AU Format Sound, and I cannot save as the file, I cannot open the file, I cannot choose an outlook app to open the file.Can anyone assist please?The pst file size is 13GB.

:)

 

Changing the File Type on an Outlook *.OST file.

I did a stupid thing and inadvertently changed the file type of an Outlook 2016 OST file to a PDF file. I have tried to change the type of file that *.OST is used by to Outlook but Windows 10 does not let me. Does anyone have any suggestions.

Thanks

 

Outlook PST File Problem

That is exactly what I was going to suggest. Export everything to another PST file, delete the old(or rather move it out of the default folder) and replace it with the new PST file that you exported.

 

Changing Time Format

Hi Mary,

There's a possibility that the set up time format in your computer Basic Input/Output System (BIOS) is military time. To have this checked, you can try to reset the time of your computer through Control Panel. See the steps below on how to do
so:

• Open Control Panel > Clock, Language, and Region >
  Change date, time, or number formats. This would open the
  Region window.
• From there, click on Additional settings at the bottom part. It will open the Customize Format.
• Click Reset; then, OK.

The steps should work; however, if not, we suggest that you contact manufacturer and have the BIOS time checked.

Let us know what happens after doing the suggestions .