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1. Start the ADSI Edit snap-in. To do this, click
   Start, click Run, type
   adsiedit.msc in the Open box, and then
   click OK.

   Note ADSI Edit is included with the Microsoft Windows 2000 Support
   Tools.
   For
   additional information about how to install the Windows 2000 Support Tools,
   click the following article number to view the article in the Microsoft
   Knowledge Base:

   301423 
   
   (http://support.microsoft.com/kb/301423/
   )
   

   How to install the Windows 2000 Support Tools to a Windows 2000 Server-based computer

2. Connect to a domain controller if you are not already
   connected to a domain controller.
3. Expand Configuration Container
   servername.example.com, expand
   CN=Configuration,DC=example,DC=com,
   and then click CN=LostAndFoundConfig.
4. View the contents of the right pane. If an object that has
   the same name as the Exchange computer appears in the right pane, right-click
   that object, and then click Delete. Click Yes
   to confirm the removal of the object.
5. Quit ADSI Edit.
6. On the Exchange computer, restart all the Exchange-related services.

Note This workaround resolves the issue for the current user. However,
you must perform this workaround every time that you create a new user.

To copy this registry value, follow these steps:

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

1. On the computer where you cannot add an additional Exchange
   mailbox to the profile, start Registry Editor. To do this, click
   Start, click Run, type
   regedit in the Open box, and then click
   OK.
2. Locate and then click the following registry subkey:

   HKEY_CURRENT_USERSoftwareMicrosoftWindows NTCurrentVersionWindows Messaging SubsystemProfiles13dbb0c8aa05101a9bb000aa002fc45a

   Note Replace with the name of the user where you
   cannot successfully add a mailbox to the MAPI profile.

3. If the 101e6613 registry entry does not appear
   in the right pane, create it. To do this, follow these steps:
   1. On the Edit menu, point to
      New, and then click Binary Value.
   2. In the New Value #1 box, type
      101e6613, and then press ENTER.
4. Copy the contents from the
   101e6613 registry entry
   of a user where you can successfully add an additional mailbox to the user’s
   MAPI profile to the new registry value that you created in step 3. To do this,
   follow these steps:
   1. Locate and then click the following registry subkey,
      where is the name of a user where you can successfully add a
      mailbox to the MAPI profile:

      HKEY_CURRENT_USERSoftwareMicrosoftWindows NTCurrentVersionWindows Messaging SubsystemProfiles13dbb0c8aa05101a9bb000aa002fc45a

   2. In the right pane, right-click
      101e6613, and then click Modify.
   3. In the Value data box, select all the
      text, press CTRL+C to copy the text to the clipboard, and then click
      Cancel.
   4. Locate and then click the following registry subkey,
      where is the name of a user where you cannot successfully add
      a mailbox to the MAPI profile:

      HKEY_CURRENT_USERSoftwareMicrosoftWindows NTCurrentVersionWindows Messaging SubsystemProfiles13dbb0c8aa05101a9bb000aa002fc45a

   5. In the right pane, right-click
      101e6613, and then click Modify.
   6. Press CTRL+V to paste the clipboard contents to the
      Value data box, and then click OK.
5. Quit Registry Editor.