Hello we´ve installt Windows Server 2003 64 Bit version. Into the company we had worldwide Exchange 2003 servers on different locations. Now I am looking for a possibility to install Exchange system management tools on the server for mmc addons for active directory users and computers to admin the exchange users. If I try to use Exchange 2003 I get error message: Microsoft Exchange Server has a known compatibility issue with this version of Windows. For information refer ... I know that it is not recommended to install Exchange 2003 on a 64 Bit OS. But recommended doesn´t meen not possible. Via Google I found several informations that there is a way to install but nobody describe how I can do that. Is there anybody how can tell me how does it work? Normally I do not need the complete installation of Exchange Server. I only need the system management tools (Properties tabs Exchange General, -Features, -Advanced and E-Mail addresses and tabs Puplished Certificates, Object and Security) . But it seem to be there is no way to install them without general installation procedure of Exchange. I am a little bit afraid to use Exchange 2007 (and I don´t know if we have a licence) because as I wrote we only have Exchange 2003 mail servers. And I would not have any impact to them by the 64 bit OS and Exchange 2007. Gratefull for every kind of help and ideas. Thomas