The rainbow wheel appears on the computer screen and the Outlook program is stalled quite regularly.  It happens every time I click on the program for any function (estimated frequency =  20 -30 times per hour).  It is negatively effecting my productivity.  Are there settings I can change to stop this?  Is this just what you get when you run a Microsoft product on Mac?  I don't have this problem with Word, Excel or Power Point - just Outlook.