We installed the "new" CU2 for Exchange 2013.  

Reference --  http://blogs.technet.com/b/exchange/archive/2013/07/29/now-available-updated-release-of-exchange-2013-rtm-cu2.aspx   ).

That article says     The new build number of Exchange 2013 RTM CU2 is 15.0.712.24

We have one Windows 2013 server with Mailbox and CAS on the same server.

Using the ecp - Exchange Admin Center   >   Servers,...we see  Mailbox, Client Access Version 15.0 (Build 712.24)

We sent an email.

See this in the headers.

(removed some parts...)

Received: from ... with Microsoft SMTP Server (TLS) id 15.0.712.24; Thu, 1 Aug 2013 09:01:10 -0400

Received: from  ... with mapi id 15.00.0712.012; Thu, 1 Aug 2013 09:01:09 -0400

The SMTP part says   15.0.712.24   ---  OK

The MAPI part says 15.00.0712.012      -- why "012" ?

Is that indicate a problem with the install,...or it is OK to proceed to production ?

Thanks.

tags -- e2013 Cumulative Update 2 KB2859928

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Good Afternoon,

During the install did you receive any errors or warnings or did it complete successfully?

Was the server in maintenance mode?

If not - I'd say proceed.. it could be the MS guys missed in the coding.

Thanks for the Reply.

There were  no errors during the Install  (none that I am aware of or saw).

I am not sure what "maintenance mode" is...sorry.

Is that a Windows 2012 term ?

The limited initial testing on that sandbox system indicates e2013 is working OK after the install.

Thanks.

Ok great.. I'd say you're go to go.

Maintenance Mode is an Exchange term.. please my blog link below for more details about performing maintenance on Exchange Servers.

http://thelifestrategist.wordpress.com/2013/07/21/step-by-step-how-to-perform-exchange-2010-maintenance-and-testing/

Interesting article about e2010 maintenance mode.
We are usign e2007 (Exchange 2007) in production.
We are not using DAG.
So to answer your original question, I think e2013 was not in maintenance mode.

Thanks.

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OK thanks. Please mark as answer.