As many of us know by now, the HMC package is being discontinued. From the HMC site:
But what will replace it? Well for the last several months there’s been a TAP program for Exchange hosting providers. They are testing out how they can deploy multiple customers in a single Exchange organization using Exchange 2010 SP1.
The CHM file they used for setting this up is now publically available. So if you’re interested in how this works, I recommend you go grab a copy here.
MCM: Exchange 2007 | MVP: Exchange Architecture