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When I process emails in Outlook on my (new) MacBook Pro, a spinning color wheel appears and the program does not respond for a minute. This started immediately after I upgraded to Mountain Lion OS X. I have re-installed Mountain Lion (Apple support's recommendation) to be sure I got a clean install.

I get the spinning color wheel with Outlook on my iMac running OS X v 10.9.5.

The Outbox and Draft Files are empty.

I cannot find the solution.

Advice?