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Message: [QUOTE="Jeff Stephenson [MSFT], post: 647053"] The problem you're having is that the information (called "UDP packets") that Exchange is sending to notify Outlook of changes to your mailbox is being blocked by something. Possible culprits are proxy servers, firewalls, and routers. Have your network administrator look at [URL]http://support.microsoft.com/default.aspx?scid=kb;en-us;815052[/URL] and see if that might be the problem. If you can't solve the network problem, you can set the registry values in [URL]http://support.microsoft.com/default.aspx?scid=kb;en-us;Q305572[/URL] (Outlook 2002) or [URL]http://support.microsoft.com/default.aspx?scid=kb;en-us;Q304849[/URL] (Outlook 2000) to cause Outlook to poll Exchange rather than waiting for notifications. [/QUOTE]