Outlook 2003 folder refresh and new mail notification issues with Exchange 2010
January 4, 2011
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After the transition of Exchange 2003 to 2010, we noticed a few issues with Outlook 2003 (online mode, not cached). Users were complaining about slow response, mail notification and folder refresh issues. The problem occurs in Outlook versions prior to 2007 due to Exchange 2010 not issuing UDP notifications.
During Microsoft Tech-Days 2010, Dave Kawula mentioned the same problem and possible solutions: http://www.insidetheregistry.com/content/viewarticle.aspx?articleid=1974
The solution for our environment was to follow KB2009942 and apply a 5 second max polling frequency to our CAS server.