I updated Microsoft Office for Mac 2011 using Microsoft AutoUpdate.App on two separate computers, each with its own registered copy of the software. While everything worked well on one computer, Outlook is no longer showing Outlook's Main Window on the other computer. I rebuilt the database but no improvement. I deleted the Outlook preferences but, again, no improvement. (I restarted the computer after each of these actions.) Prior to this update, Outlook was working fine.

I would appreciate any suggestions for other things to try.