Read Only Multivalueproperty

Trying to install Exchange 2007, gets as far as setting up CAR, and i get an error:

Summary: 2 item(s). 0 succeeded, 1 failed.
Elapsed time: 00:00:46

Client Access Role

Read only MultiValuedProperty does not support this operation.

An unexpected error has occurred and a Watson dump is being generated: Read only MultiValuedProperty does not support this operation.

Elapsed Time: 00:00:46

Unified Messaging Role

any ideas where to look?  never seen this before

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link seems to be dead, if anybody else runs into this you need to do the following.

You need to use Adsiedit.

Navigate to Configuration > CN=Services > CN=Microsoft Exchange > CN=(your Exchange org
name) > CN=Address list container > CN=Offline address list.

In the right pane right-click on the CN=default OAB and go to Properties.

Locate the value MsExchVersion. If that is not set, set the value to 4535486012416.
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