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When you install SBS 2011, the Exchange Server 2010 installation should be activated automatically. However, in some cases, you it might not be. Typical situations where Exchange 2010 is not activated automatically include: Manual removal and installation of Exchange Server 2010 Active Directory communication problems during installation There is no license key provided for Exchange Server 2010 in SBS 2011. Instead, you need to download a hotfix from Microsoft to activate Exchange Server 2010. The hotfix is available here:  http://support.microsoft.com/default.aspx?scid=kb;en-US;2527626

Normally when you install Dirsync for account synchronization with Office 365, you let it install and configure a local instance of SQL Express. However, in large environments (over 50,000 accounts or so), you need to use a full version of SQL server to support a larger database and more memory. To install Dirsync for a full version of sql, you need to use the following command-line to install: dirsync /fullsql After following the wizard to install Dirsync to the correct location, you still need to do some configuration. You specify the location of the SQL Server by using the Dirsync Install Shell. You start this PowerShell prompt by running C:\Program Files\Microsoft Online Directory Sync\DirsyncInstallShell.psc1 . Then for a local SQL instance, you run: Install-OnlineCoexistenceTool -UseSQLServer -Verbose When you run the psc1 file from Windows Explorer, it does not open with administrative privileges even if the account you are using is an administrator. You need to run the install