i am doing an Exchange 2003 upgrade in a few weeks. I am having a problem with an Office 2003 deployment that I pushed through the Custom Installation Wizard/MST. The MST set users' Outlook so that cached mode could not be chosen, and it became greyed out. I have since changed that, (because I am now a fan of the cached mode) The problem is, users that had that setting cannot change the cached mode setting or the mail server (greyed out). This will be a problem when upgrading to a new server (with new server name). My only workaround has been to delete the user's Windows profile. this tip was given to me but doesn't work: http://www.howto-outlook.com/howto/cachedmoderegkey.htm if anyone overcame this obstacle, please let me know how. thanks in advance. -J