Outlook 2010 - GPO to restrict attaching to Office365 email.

Hi, One phase of an Exchange migration requires some users to be able to utilise Outlook client to access their old mailboxes (hosted on Exchange 2003 servers) & access Office 365 email via Internet Explorer.  However we don't want this group of users to use the Outlook 2010 (fat) client to access their Office365 mail - only via IE.
Is it possible to restrict creation of Outlook profiles to point to the the Office365 hosted email?  I thought this may be potentially possible via Group Policy???  Any advice would be greatly appreciated........thanks.
Michael PorterAsked:
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Vasil Michev (MVP)Commented:
Where is your autodisover pointing at? You can use the reg keys in this article to 'force' Outlook to use only specific lookup and exclude the one needed for EO (the HTTP root domain): http://support.microsoft.com/kb/2212902

But in your case a better solution probably is to simply disable MAPI access to the mailboxes in question:

Set-CASMailbox blabla -MAPIEnabled $false

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I guess you should also consider disabling IMAP/POP/EWS protocols, etc.

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