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

Symptoms

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.

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:

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