In addition to the features provided by Office Messenger the Professional Edition provides:

Automated Address Book (contact) updating across the network.

This allows contacts to be marked as shared. Shared contacts are automatically kept up to date for all instances of Office Messenger on the LAN.

Contact sharing is fully configurable, and each user can choose whether to send out contact updates, and whether to accept updates. If updates are accepted the user can choose how updates will be handled and what information can be updated.

Address Book Import

Import contacts from Microsoft Outlook.