I am looking for someone who has completed an Office 365 migration AND then decommissioned their entire Exchange environment (or if you haven't, I'm interested in what your plans are for your MX server).
I am investigating Office365 and trying to find out if it's possible to use SSO and dirsync without maintaining an on-premise Exchange server. Microsoft support recommends keeping an MX server on premise to manage some settings but, I'm concerned that this recommendation is short-sighted. I started a thread about it on their forum...
It would be great if I could discuss this with someone who has actually completed this transition.