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I have a recurring issue with Outlook 2007 completely locking up while editing a message. The environment is Exchange 2003 and the client OS is both Windows 7 64 and Windows XP 64. It seems to happen more often on the Windows 7 machines. The symptoms are usually the same. When editing a message, usually very early in the process, Outlook 2007 continues to draw it's windows but the mouse just disappears when hovering over any of them. Outlook.exe uses 100% of one core and stops responding to all inputs.

I've googled extensively and tried a few things, like deleting and recreating the MAPI profile, but nothing has done any good. I don't know what to try next.

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I think it was a corrupt profile. I created a new Windows user profile and the problem hasn't recurred since. – ubernerd Sep 29 '10 at 14:28
Or not. It has returned even under the new profile. – ubernerd Oct 12 '10 at 17:43

Could be a flakey add-in causing the problem. Try starting Outlook with the /noextensions switch.

See below for more command line switches for Outlook 2007 which may help with troubleshooting. Command-line switches for Microsoft Office Outlook 2007

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