A time-out may occur in Exchange Server 2007 when the SA resource is trying to come online
To use Cluster Administrator to set a time-out value
Open the properties of the SA resource, click the
Advanced tab, and then change the pending time-out value to 150 seconds.
To use the command prompt to set a time-out value
Opan a command prompt, type the following command, and then press ENTER:
cluster res “Exchange System Attendant Instance (CMS Name)” /prop PendingTimeout=150000