Exchange 2013 - Shared Calendars internally


We've migrated from Exchange 2003 to 2013 recently.  Pat of the migration was to retire the public folders, which included shared calendars.  As a surrogate, we have created accounts to host the shared calendars, which works well for OWA and for Outlook users, after some user training.

My challenge is this:
I would like to make better Sharepoint landing points with our calendars.  From the Technets and Exchange blogs, I gather that the method to do so would be to enable Individual Sharing.  I've included a screen shot of the setting on the ECP.  However, in my environment, that option is not available.  I've included a screen shot of my environment.

How can I make this setting available?
Tutorial based:
Screen cap of the instructional articles showing "Individual Sharing"
Our environment:
Screen cap of our environment
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David Johnson, CD, MVPOwnerCommented:
The tutorials you are seeing are for a higher level of Office 365 Online.  You first have to enable the federation Trust

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149CFAuthor Commented:
My email domain is different then my internal user domain.  Would enabling Federated Trust be applicable or even enable sharing the calendar with my user domain?

I understand the sharing permissions and domain restrictions for calendar publishing, but it is the Federated Trust setup and applicability that is tripping me up. I only have a single Exchange server, and before proceding down the steps of enabling Federation Trust, I would like to know if my environment would even benefit, since there are no other exchange servers or azure ADFS to federate with.
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