Offline address book error 0X8004010F

I had a helpdesk call sent to me from a frustrated helpdesk analyst as the users on the site kept on getting the following error in outlook. 

After examining the Exchange server for any errors in the event viewer, the error was found and could be replicated by rebuilding the offline address book

To fix the issue do the following. First lets recreate the issue by going to offline address book in the exchange 2010 MMC, right clicking on Default offline address book and clicking on update as highlighted in yellow

Go to event viewer and you will see two event s generated 9360 and 9340. Now for the fix.

Open up regedit  and navigate down to “HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet \Services\MSExchangeSA\Parameters.

Now add a DWORD with the following value name “OAL Post Full If Diff fails” and the value data of 1.

Go back and rebuild the OAB and go back to event viewer and look for event id 9107, in my case I got 9411 which is also ok.

Now go back to regedit, and remove the key you created. That should resolve the issue, again test this by rebuilding the OAB and checking the event viewer, but if it doesn't work, you should restart your Exchange server which normally resolves the issue.