To use mobile devices to connect to your Exchange Server 2010 environment. Generally there are two ways to connect: through Outlook Mobile Access and, Exchange Active Server Sync.
In order to prepare ur mobile device for Active Synchronization u have to check if ur mobile device operating system is able to use this feature.
1st setup a New Partnership, then select Synchronize with this…..
Now supply necessary info as the db asks and select synchronization settings, then click Enable synchronization ….option
Now configure Logon settings if necessary do Fine tuning
After this ur mobile device is prepared for Active Sync. Now a first synchronization starts where ur mobile device transfers its IMEI number, mobile phone number and the users information and saves it there as properties of the user itself. After this directory service knows the connection data and is able to interact with ur mobile provider.
Hope it helps u !