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SharePoint 2007: Migrate user - Could not load user migrator assembly

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Symptoms

We get the following error when we try to run the following command :

stsadm -migrate user -oldlogin <userid> -newlogin <newuserid>
-ignoresidhistory

"Could not load user migrator assembly "Microsoft.SharePoint.Portal,
Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c", class
"Microsoft.SharePoint.Portal.PortalAccountMigrationManager", referenced in
feature "f0deabbb-b0f6-46ba-8e16-ff3b44461aeb"."

 

Cause

Have applied only the hotfix KB 979445 without applying KB
983444

Resolution

Apply hotfix KB 983444, this resolves the issue

More Information

Here is the supporting documentation from the
FAQ of the technet site https://www.microsoft.com/technet/security/bulletin/ms10-039.mspx
:

In what configurations will I need to apply the different updates?

You will need to apply one or both updates, depending on which SharePoint product is
installed on your system. For systems with only Microsoft Windows SharePoint
Services 3.0 installed, you will need to apply the KB983444 update. For systems
with Microsoft Office SharePoint Server 2007 installed, you will need to apply
both the KB979445 and KB983444 updates. There is no configuration where you can
only have Microsoft Office SharePoint Server 2007 and not Microsoft Windows
SharePoint Services 3.0.