Resolution
 fact
Exchange Migrator 2.x
symptom
Mailbox migration hangs at 'Updating Directory Objects' and mmc.exe consumes a large amount of memory.
cause
fix
  
Exchange Migrator 2.x
symptom
Mailbox migration hangs at 'Updating Directory Objects' and mmc.exe consumes a large amount of memory.
cause
This problem is caused by one of the following:
- EXCHMEM.DLL is missing from the 
\winnt\system32directory on the machine running Exchange Migrator. - Exchange Migrator is processing a NULL property value when attempting to update properties of the target object. The following entry can be found in EMDevlog.txt: Updating Object() with property 
LDAP://.....' 
fix
If EXCHMEM.DLL is missing from the \winnt\system32 directory:
- Close Exchange Migrator.
 - Copy EXCHMEM.DLL from the 
\Exchsrvr\bindirectory into the\winnt\system32directory. 
To resolve the NULL property issue:
- Close Exchange Migrator.
 - Perform one of the following:
 - Install Post EM 2.2 Service Pack 1 Hotfix 027949 (https://www.netiq.com/support/em/hotfixes.asp)
 - Upgrade to Exchange Migrator 2.3 (https://www.netiq.com/support/em/extended/upgrade.asp)
 
Additional Information
 Formerly known as NETIQKB25069