Unable to open your default e-mail folders error when using Autodiscover if user is moved cross forest

Original KB number:   2387770

Symptoms

When you use Autodiscover to connect to an Exchange Server 2010 SP1 mailbox, an Outlook client may present one or both of the following error messages repeatedly:

Unable to open your default e-mail folders. The Microsoft Exchange Server computer is not available.

Microsoft Exchange administrator has made a change that requires you quit and restart Outlook.

The following should also be true:

• The mailbox in question was moved across Active Directory forests in the past (a move from one Exchange organization to the other).

• The mailbox was, or still is enabled for personal Archive.

• If you run the Test e-mail Auto Configuration test for the Outlook client, you might see the discrepancy in the following two lines of test results (on the XML tab):

  <AutoDiscoverSMTPAddress>alias@domain1.com</AutoDiscoverSMTPAddress>
  <Server>servername.domain2.com</Server>
  

  Note

  The domains do not match.

Cause

When a mailbox is being moved across different Exchange forests, the mailbox enabled user in the original forest is converted to a mail enabled user. If that mailbox is also enabled for personal Archive, one of attributes that the original forest object (a mail enabled user) can have is called msExchArchiveDatabaseLink. If present on the mail enabled user, the attribute will likely point to a database in the wrong forest - as the user's mailbox is now in the forest where it was newly moved.

The conflicting information will then confuse an Outlook client during the Autodiscover process, causing it to report errors as mentioned above.

Exchange Server 2010 SP1 cross forest move will not create this problem, as the attribute will be cleared properly during the mailbox move.

Resolution

If you have moved archive-enabled mailboxes cross forest prior to installing Exchange Server 2010 SP1, we recommend that you clear the value of the msExchArchiveDatabaseLink attribute on any mail enabled users that might have them populated. You can use a tool such as ADSIEdit to remove the value of this attribute.

More information

To run the Test e-mail Auto Configuration test:

1. Press and hold the Ctrl key and then right-click the Outlook icon in the system tray.
2. Select Test e-mail Auto Configuration.
3. In the E-mail Address box, type the alias of the affected user.
4. In the Password box, type the user's password.
5. Select the Use Autodiscover check box, and then select Test.