new users in offline address book

hi,

i have 2 cas server exchange 2010 in cas array and 2 mailbox server in DAG exchange 2010 all server are SP2, if i create a new user in exchange its not updating in offline address book, but once i run the below command and restart the Microsoft Exchange File Distribution on cas, after that i can see the new users in offline address book

Get-OfflineAddressbook | Update-OfflineAddressbook

Get-ClientAccessServer | Update-FileDistributionService

restart the Microsoft Exchange File Distribution (CAS server)

kindly suggest.

regards

sameer

regards Sameer Shaikh