- You have Update Rollup 3 for Microsoft Exchange Server 2010 Service Pack 1 (SP1) or a later update rollup installed in a Microsoft Exchange Server 2010 environment.
- You enable the User Datagram Protocol (UDP) push notification feature on an Exchange Server 2010 Client Access server.
- You access a mailbox by using Microsoft Office Outlook 2003.
Note When this issue occurs, users who are using Outlook cannot access the Exchange Server 2010 mailboxes for a short time.
Article ID: 2700705 - Last Review: May 31, 2012 - Revision: 1