Outlook is an application many of us rely on every day, and yet, it's not immune to causing problems here and there.

To resolve the 'Word cannot open the existing file (Normal.dotm)' error, reset the Normal.dotm file, use Open and Repair, and disable add-ins.

If OneNote Sections or Pages disappear, follow these instructions. To fix the issue, use the OneNote Diagnostic Tool, sync manually, create a new section, etc.