Weird public folder permission issue - exchange 2007 to 2010

We have an environment where we have Exchange 2007 and 2010 co-existing together whilst we migrate users gradually.

All users moved to the exchange 2010 server (which has a public folder database replica on it) get an access denied bounceback when e-mailing a certain public folder.

The issue does not exist for users who's mailboxes exist on the 2007 server.

What I have determined is that there are no default permissions on the folder, only a permission for anonymous users exist that allow "create items".

My theory is this... is that for some reason, users on 2007 are allowed to send to it because anonymous are allowed to, where 2010 is more specific and whilst anonymous users can send messages to it, "default" users can't.

Is this this the case and if so, should correcting the default permissions to match the anonymous permissions fix this issue for mailboxes on the 2010 server.

#554 5.2.0 STOREDRV.Deliver.Exception:AccessDeniedException.MapiExceptionNotAuthorized; Failed to process message due to a permanent exception with message Cannot complete delivery-time processing. 

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Cheers.
tegeniusAsked:
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Simon Butler (Sembee)ConsultantCommented:
Internal users are not anonymous. I am surprised this works for Exchange 2007 users as that has been the case since Exchange 2003.

If you want internal users to send to the folder then you need to grant either Default as create items, or add in your equivalent of all staff to the list with the permission.

Simon.
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tegeniusAuthor Commented:
Thought this was a weird one too. Cheers for your insight Simon. I'll modify the permissions to resolve this.

Cheers.
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