Exchange 2010 SP1 Limits the Number of ActiveSync Devices You Can Synchronize

By default Exchange 2010 SP1 limits the number of ActiveSync devices you can synchronize to 10.

The solution is this PowerShell script:

Set-ThrottlingPolicy –EASMaxDevices 50 –Identity DefaultThrottlingPolicy_hex_string

See this excellent blog post by MobilityDojo.net: http://mobilitydojo.net/2010/09/03/exchange-2010-sp1-limits-the-number-of-activesync-devices-you-can-synchronize/