Outlook 2007 OAB error message 0x8004010f

We are running MS Exchange 2007 in CCR mode and HUB & CAS servers on NLB. Clients connecting to the server in using Outlook 2007 in Cached Mode via RPC/HTTP are getting the 0x8004010f error message while synchronizing or trying to download the OAB. The PCs and laptops are running either Windows XP or Windows Vista.
Who is Participating?
The error code means cannot find.
Which method of OAB distribution are you using? Public Folders or Web?
If you run the autodiscover diagnostic (hold down CTRL while right clicking on the Outlook icon in the system tray) it will show you which method Outlook thinks it is, and if it is web, the URL. Check the URL is correct.
If it shows it as public folders, then ensure that you have a public folder store mounted and that each store has the correct public folder store allocated to it.

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