Exchange 2010 SP1 Information for Hosted Service Providers

http://social.technet.microsoft.com/wiki/contents/articles/exchange-2010-sp1-information-for-hosted-service-providers.aspx

Several features and functionality that aren't available or supported in the hosting version:

• Exchange Management Console
• Public Folders
• Unified Messaging Server role
• Federation
• Global Address List Synchronization (GalSync)
• Business-to-Business features such as cross-premises message tracking and calendar sharing
• Information Rights Management (IRM)
• Managed folders
• Outlook 2003 support (EnableLegacyOutlook)
• Edge Transport Server role (more specifically EdgeSync support)
• In-place Upgrades (upgrading current Exchange 2003/2007 org to Exchange 2010)
• Resource forest topologies (separate Exchange forest and account forests)
• Parent-child domains
• Multiple AD sites (where there's a mix of hosted and non-hosted)
• SSO AD Trusts
• Dis-contiguous namespace
• Disjoint namespace