Hi - We currently have a Exchange on-premise 2010 environment in a DAG across two sites with 12 databases housing approx 2500 mailboxes and Unified Messaging hosting voice mail. Apart from some initial teething problems due to disk latency, the setup has worked great for the past 4 years, and Exchange has not missed a beat.
I am now at the stage where I am considering upgrades to either Exchange 2013 on-premise or Exchange Online O365. As part of some POC testing I have set up a tenant in O365 and have moved some mailboxes and it is working fine. So I suppose I am looking for anyone who has gone through a similar experience with a hybrid scenario and if they can detail any gotchas with a O365 migration, and if they had their time again, would you choose to stay on-premise? I've read lots of technical documentation around this but I would like to hear any feedback from the real world to give me some idea of direction that I choose. On top of this, a couple of questions ADFS vs DirSync? I have dirsync set up. Is ADFS a benefit for O365? Does single sign on work for Outlook 2010+ or is there still credential pop up? Express Route - Are companies using this for Exchange online? Unified Messaging - I'm still getting my head around this part.. Any ideas or views appreciated! Thanks for that. Todd
