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I have an Exchange 2007 server, two Exchange 2013 hybrid servers with mailbox, HT and CAS role installed and I have migrated most of my mailboxes from Exchange 2007 to Office 365 Exchange Online.<br />
&nbsp;<br />
Everything works great but now I have to move the remaining mailboxes on exchange 2007, which for various reasons must remain on-premise, to the Exchange 2013 hybrid servers and then decommission my Exchange 2007 Exchange server. I am going to build a third Exchange 2013 hybrid server so I can configure a DAG.<br />
<br />
I have the instructions on how to setup an IP-less DAG.<br />
<br />
What should I be aware of during this process?<br />
Are there any gotchas I should be aware of?<br />
Aside from the DAG setup, are there any changes I need to make to my current Exchange 2013 hybrid server install?<br />
<br />
Thank you.
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I have an Exchange 2007 server, two Exchange 2013 hybrid servers with mailbox, HT and CAS role installed and I have migrated most of my mailboxes from Exchange 2007 to Office 365 Exchange Online.
 
Everything works great but now I have to move the remaining mailboxes on exchange 2007, which for various reasons must remain on-premise, to the Exchange 2013 hybrid servers and then decommission my Exchange 2007 Exchange server. I am going to build a third Exchange 2013 hybrid server so I can configure a DAG.

I have the instructions on how to setup an IP-less DAG.

What should I be aware of during this process?
Are there any gotchas I should be aware of?
Aside from the DAG setup, are there any changes I need to make to my current Exchange 2013 hybrid server install?

Thank you.

How can I create a DAG in Exchange 2013?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.