After updating iTunes, some people are experiencing crashes in Outlook, due to issues with the OutlookChangeNotifier addin. If this happens to you, you need to rename the file.
Go to C:\Program Files\Common Files\Apple\Mobile Device Support\
Rename OutlookChangeNotifierAddin.dll (add .old to the file name), and Outlook should work again.
Published October 18, 2010. Last updated on June 17, 2011.