Many will be upgrading to Exchange 2010 SP1 soon.  Many of you also have Blackberry Enterprise Server.  RIM has provided a pre-installation guide for Exchange 2010 here.  I wanted to touch on one of these pre-installation steps.  This is where we increase the maximum number of connections to the Address Book service.  The specific guide for this step is located here.  As you can see, you have to go into the following file “microsoft.exchange.addressbook.service.exe.config” and set MaxSessionsPerUser to 100000.

In Exchange 2010 SP1, MaxSessionsPerUser does not exist anymore.  You can take a look at an Exchange 2010 SP1 “microsoft.exchange.addressbook.service.exe.config” file below:

--> see on the blog :

http://www.shudnow.net/2010/08/24/exchange-2010-sp1-and-blackberry-enterprise-server/