A few AD and Exchange prerequisites required for Cisco Unified Messaging service[1]. After SP2 RU3 Exchange throttling policies moved to the mailbox level, so script was required for proper setup.

References:

  1. 1: Cisco UC reference http://www.cisco.com/en/US/docs/voice_ip_comm/connection/8x/unified_messaging/guide/85xcucumg020.html#wp1195262 ↩