Exchange 2013 mailbox unable to access Exchange 2007 Public Folders

I am in the process of migrating from Exchange 2007 to Exchange 2013. This is a staged migration over the next few weeks but I need the users I have migrated to EX2013 to be able to access the public folders on EX2007.

Currently within outlook for the EX2013 users they have no access to the Public Folders.

Is there a set of steps I need to go through to get this working? I have found instruction on setting up a Proxy mailstore however I am currently using my allocation of 5 mailstores so this is not an other for me.
Daniel GradwellAsked:
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Simon Butler (Sembee)ConsultantCommented:
Before going any further... have you seen the article by the Exchange team on public folder coexistence?

http://blogs.technet.com/b/exchange/archive/2014/11/07/on-premises-legacy-public-folder-coexistence-for-exchange-2013-cumulative-update-7-and-beyond.aspx

Simon.
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Daniel GradwellAuthor Commented:
Hi Simon,

Thanks for this. Does this not require I setup a proxy on the Exchange 2007 box requiring a mailstore licence?

Thanks
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Simon Butler (Sembee)ConsultantCommented:
Where have you got the idea that you need to have a proxy server from?
I don't recall anything about a proxy server being required, certainly not in recent documentation.

Simon.
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Vincent BurtonCommented:
I would like to confirm if the issue has been resolved as per above suggestions which looks good to get this job done. If not yet, then please have a look on below given informative resources which might be helps you.

step by step guide for the migration and co-existence of Exchange 2010/2007 to Exchange 2013: http://msexchangeguru.com/2013/05/10/exchange2013-migration/comment-page-14/

Configure legacy public folders where user mailboxes are on Exchange 2013 servers

You may also take help from these articles:
Migrating Public Folders to Exchange 2013

Users of Exchange Server 2013 or Exchange Online can't open public folders or shared mailboxes on an Exchange 2010 or Exchange 2007 server
Hope it helps you!
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Daniel GradwellAuthor Commented:
Afternoon All,

We have made a small step forward on this problem. It turns out that SiteFolderServer & msExchHomePublicMDB in ADSIEdit was pointing to a deleted item.

We cleared these attributes and it stopped the constant message of restart your outlook.

The problem we now have is users with their mailbox on Exchange 2013 still can't access the public folders on the Exchange 2007 server.

I assume this is because msExchHomePublicMDB is blank so Exchange 2013 doesn't know where to connect to. Does anyone know what information should be in this attribute?
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Simon Butler (Sembee)ConsultantCommented:
The value will be something like this:

CN=Public Folder Database,CN=Second Storage Group,CN=InformationStore,CN=SERVER,CN=Servers,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=domain,DC=local

The easiest way to find it is to find the public folder database in adsiedit, then copy its "distinguishedname" value.

Simon.
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