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I have this on two separate OpenXchange servers which I have just built from CVS
I see no compiler errors when builting open-xchange-gui
Also, when I go through the configuration menu and select 'Extras' I get a page not found error for 'umin'
this link is for integrating 3rd party control centers. At Open-Xchange Express Edition, this option is used for the "umin" (User Administration) where the logged in user can change his password or set vacation notices. This feature is not included at the CVS version - thats why you get this message.