http://blog.flaphead.dns2go.com/archive/2007/02/08/update-microsoft-exchange-calendar-update-tool.aspxJust a follow on from my last blog . It looks like a potential issue with this tool Currently, MSEXTMZ.exe and MSEXTMZCFG.exe will NOT run correctly if they are installed in the default installation directory (i.e. c:\program files\msextmz). To workaroundenCommunityServer 2.1 SP2 (Build: 61129.2)