This is for Lync 2013 actually related to mobility. I have lync servers setup only in Virginia, where my mailbox also resides and when I connect to lync mobile, it is able to pull my meetings on my iPhone. However, users on other sites get "We can't connect to Exchange. Please try again later." When I move those mailboxes to Virginia, it is able to pull the meetings.
So meetings can only be retreived if the mailbox resides in the same site as where the Lync servers reside.
Anyone seen this issue b