Calendar Invites are showing up empty with no way for users to accept in hotmail/msn from exchange 2013

Hey there, We have an exchange 2013 server and my team is using Outlook 2013.  
If I create an appointment in the calendar and invite one of my team, the receive the invitation with the accept dialog that they can click on.
If I send the same invitation to someone outside of our organization with a hotmail account (was able to replicate with my own hotmail account), the message shows to their inbox with nothing about the appointment listed, or any way to accept it.  The name of the appointment comes through as the subject, but nothing else.

THIS ALSO HAPPENS FROM OWA...I thought it might be a problem with outlook, but looks more like exchange.

It almost looks like it is not trying to send a calendar invite at all, but an e-mail

Any help is appreciated.
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bcameron70Author Commented:
I found the answer, it is because exchange 2013 sends as MAPI by default, and you need to enter a couple commands on powershell to set it to never send using mapi...make sure to do it to both mailusers and mailcontacts

here is the link

Took me a lot of searches to find it, hope it helps others...TGF Google search!

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