Fix spell cheking in MS Outlook 2007

Problem
You had installed MS Office 2007 and now you find out that spell cheeking doesn't work in MS Outlook, but works in MS Word. Welcome to the planet MS!

Fix

1. Delete (or rename) registry key

   HKEY_CURRENT_USER\Software\Microsoft\Shared Tools\Proofing Tools\1.0\Override

2. Restart Outlook