Hi all,I need just a little bit of help. I looking for information about hosting services for exchange. I have some clients that are asking me about this. I know I can have different email domains on an exchange server but I cannot find a clear answer to whick version do I need, do I need windows cals as well as exchange, etc.. can someone provice me with some details or point me in the right direction.Thank you allHarry

Service provider licensing is probably your best bet. They also have docs on setting up exchange for hosting (although I only had access to them when i worked for a hosting company with SPLA) http://www.microsoft.com/serviceproviders/licensing/default.mspx