Strange Outlook 2007 Error

Today I started getting a fabulous new message from Outlook 2007 whenever I tried to open pretty much any type of object, i.e. a mail message or a calendar appointment:
Could not install the custom actions. The object could not be found.

Curious I thought, this was all working yesterday. It turns out it seems to be a corruption of the form cache file frmcache.dat.
  1. Close Outlook. Wait a few seconds for it to finish shutting down in the background.
  2. Go to your c:\users\[USERNAME]\Appdata\Local\Microsoft\FORMS directory and delete the cache file from there.
  3. Restart Outlook and the problem should have gone away.

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