[tomkat]

Find this and back it up to a thumb, etc:

C: \ Users \ yer user name \ AppData \ Local \ Microsoft \Outlook \ Outlook.pst

If you use Outlook's Calendar, search for *.ics and save the result/s likewise.

On new or upgraded system, reinstall Office, then < File / Import / Import from another program or file / Personal Folder File (.pst) >

[tomkat]

Some helpful info here, w/ pics for clarity:

Where is My PST File and How Can I Move It Somewhere Else?