Calendar Sharing Exchange 2010

We are using Exchange 2010.

We want to be able to access calendar only on an iPhone client; but our security policy does not allow us to enable full ActiveSync access.
Our remote email access is via TMG.

I had an idea to create an Office 365 account and to share the calendar with this account; then to access the Office 365 account from the iPhone.

I set up federated trust for our domain successfully.
I then set up an Organization Relationship to allow free/busy access with time, plus subject and location, allowing a specific security group and a specific domain (the Office 365 account).
I then configured a Sharing Policy (not sure if I needed to do this - specifying the Office 365 domain and Calendar sharing with free/busy information plus subject, location and body) and applied to the specific mailbox.
When I go to OWA 2010 (as my desktop uses Outlook 2007) I can share my calendar with the Office 365 address - this appears as a Reviewer for the Calendar.
However from the Office 365 account, the calendar appears in the list but is empty of any information.

As I'm not receiving any errors in the setup I'm not sure if I've set this up correctly or if my firewall or TMG might be blocking this - or if it's not possible.

Any help gratefully received, thank you
itadminukAsked:
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itadminukConnect With a Mentor Author Commented:
closing this as not got anywhere
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Vasil Michev (MVP)Commented:
Those are two different things, which serve different purposes: one is company-wide sharing, the other one is user-based sharing. So you shouldn't need both.

In your case, org relationship should be the way to go, as sharing policies are applied to Exchange 2013 mailboxes only. You will need SP2 for your Exchange 2010 boxes though.

The important question here is, are you in hybrid with Office 365 or have you set up entirely new O365 tenant?

Here is the general article on sharing just in case:

http://technet.microsoft.com/en-us/library/dd638083(v=exchg.150).aspx
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itadminukAuthor Commented:
Thanks for your response, Vasil.
Its a separate Office 365 not a hybrid.
I've removed the mailbox from the sharing policy for now, but I think they do exist in 2010 and can't restrict to 2013 mailboxes (I have seen your article but think this is a 2013 article)
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itadminukAuthor Commented:
I'm going to resubmit a different question as have given up on sharing policies
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