1.) How difficult is it to setup Exchange to use multiple domains (not just sub-domains). 2.) How MANY domains can it handle?3.) We want to use Exchange to handle many separate domains (~1000) for our clients. Are we going down the wrong path? Thanks for any help.Jason

Dear customer: I dont understand your post totally. We need to clarify the issue: 1. Do you means that you want to configure Exchange 2007 to accept E-mail for more than one authoritative domain? If so, please refer to the following documents: How to Configure Exchange 2007 to Accept E-Mail for More Than One Authoritative Domain http://technet.microsoft.com/en-us/library/aa996314(EXCHG.80).aspx Thanks for your cooperation. if anything is unclear, please feel free to let me know. Rock Wang - MSFT