v15.1 is Exchange 2016. They didn't bump the major version number. Except for OWA (ootw), 2016 is an incremental update to Exchange 2013. The 2016 fork on O365 happened very early in the year.
________________________________ From: [email protected] <[email protected]> on behalf of Ramatowski, Paul M.. <[email protected]> Sent: Thursday, October 1, 2015 2:28 PM To: [email protected] Subject: RE: [Exchange] RE: Exchange 2016 RTM's Huh. I was going by this- On my mailboxes everything is still v15.1 Several different build numbers. AdminDisplayVersion : Version 15.1 (Build 274.16) AdminDisplayVersion : Version 15.1 (Build 280.20) AdminDisplayVersion : Version 15.1 (Build 268.17) AdminDisplayVersion : Version 15.1 (Build 274.16) Which seemed strange because back in June my version was AdminDisplayVersion : Version 15.1 (Build 195.15) From: [email protected] [mailto:[email protected]] On Behalf Of Beauvais, Dave Sent: Thursday, October 01, 2015 2:20 PM To: [email protected] Subject: RE: [Exchange] RE: Exchange 2016 RTM's Importance: Low Yes, for several months delivery status notices, resource booking responses, etc. from Exchange Online have a line at the bottom indicating the message was generated by Microsoft Exchange Server 2016. Dave Beauvais -- Dave W. Beauvais Exchange and Office 365 Services Administrator Ohio University Office of Information Technology From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Steve Ens Sent: Thursday, October 1, 2015 14:06 To: [email protected]<mailto:[email protected]> Subject: Re: [Exchange] RE: Exchange 2016 RTM's I think it already is. On Thu, Oct 1, 2015 at 1:02 PM Ramatowski, Paul M.. <[email protected]<mailto:[email protected]>> wrote: I was opening a premier ticket (for O365) this morning and noticed 2016 it in the product dropdown:) Wonder if/when 2016 will become the cloud backend... From: [email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Michael B. Smith Sent: Thursday, October 01, 2015 1:33 PM To: [email protected]<mailto:[email protected]> Subject: [Exchange] Exchange 2016 RTM's In case you hadn't noticed, Exchange 2016 RTM'd a couple of hours ago. Evolutionary from a 2013 perspective. Quite a few changes from a 2010 perspective. Available for download already. http://blogs.technet.com/b/exchange/archive/2015/10/01/exchange-server-2016-forged-in-the-cloud-now-available-on-premises.aspx
