How To mapped Folder to client computer with windows server 2008 group policy

Create a new Policy, go in to User Configuration, Choose Preferences, go to Windows Config, Drives, and create a new Mapped drive. Thats it.

http://blogs.technet.com/b/askds/archive/2009/01/07/using-group-policy-preferences-to-map-drives-based-on-group-membership.aspx?Redirected=true

First of all this folder must be shared folder and permissions must be configured for users

Goto Group Policy create Group Policy object. rename it, Goto user configuration--> Preferences -->Drive maps-->>At the right side Right click mouse click to New-->> Mapped drive

Select the folder to want to map from shared location

Select the Letter you want to assign to mapped folder and check the Reconnect. 

After all settings link this Group Policy Object to OU which you want to apply.