How to Delete Outlook's Add-In Cache File

01
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Make sure Outlook is not running

Click
Click "OK". Heinz Tschabitscher
  • Make sure Outlook is not running.
  • Press Windows-R.
  • Type "%localappdata%\Microsoft\Outlook" (not including the quotation marks).
    • Using Windows 2000 or XP, use "%appdata%\Microsoft\Outlook" instead.
  • Click OK.
02
of 03

Highlight the "extend.dat" file

Highlight the
Highlight the "extend.dat" file. Heinz Tschabitscher
  • Highlight the "extend.dat" file.
03
of 03

Press "Del"

Press
Press "Del". Heinz Tschabitscher
  • Press Del.
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