In Exchange Server 2010 SP1 is was possible to create a hosting specific implementation by using the /hosting switch during setup. The /hosting implementation is discontinued by Microsoft and replaced by Address Book Policies in Exchange 2010 SP2 and the Address Book Policies solution is continued in Exchange 2013.
There’s quite a lot of demand in the market to build a hosting environment (multi tenant) based on Exchange 2010. In the past there was hosted Exchange (in Exchange 2003) and Address List Segregation (Exchange 2007) and the /Hosting option in Exchange Server 2010. The latter is no longer recommended by Microsoft and Microsoft now recommends to use an Enterprise deployment of Exchange Server 2010 SP2, combined with Address Book Policies (ABP) and a 3rd party Control Panel providing the ‘glue’ to get the various parts together.
Microsoft released a number of articles and whitepapers on the future of Exchange hosting and some guidance documents regarding building a hosting environment and migrating from an old platform to a new (Exchange 2010 SP2) platform: Continue reading Building Hosted Exchange 2010 – Part I
In an earlier article I explained a bit about the hosting features that are available in Exchange Server 2010 SP1. This hoster edition (I’ll abbreviate this to HEX2010SP1) is primarily targeted towards hosting companies, you need for example an SPLA license agreement to resell this.
Note: if you need really to address this functionality inside an enterprise organization, then you have to stick with Exchange 2007. Or you have to wait for Exchange 2010 SP2 which will likely contain this functionality in a form of Address Book Policies.