You cannot connect to an Exchange Server 2010 mailbox simultaneously by using Outlook Anywhere from several Windows XP-based computers

Applies to: Exchange Server 2010 EnterpriseExchange Server 2010 Standard


Consider the following scenario:
  • You deploy several Microsoft Exchange Server 2010 Client Access servers in an Exchange Server 2010 environment.
  • You configure load balancing on the Client Access servers by using source IP affinity.
  • You use Outlook Anywhere to connect to a mailbox from a Windows XP-based computer.
  • You try to connect to the mailbox simultaneously by using Outlook Anywhere from another Windows XP-based computer.
In this scenario, you cannot connect to the mailbox from the second Windows XP-based computer.


To resolve this issue, install the following update rollup:
2425179 Description of Update Rollup 2 for Exchange Server 2010 Service Pack 1


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about load balancing in Exchange Server 2010, visit the following Microsoft website:For more information about Outlook Anywhere, visit the following Microsoft website: