troubleshooting Question

Exchange 2010 to Exchange 2016 migration and URLs

Avatar of Alan Cox
Alan CoxFlag for United States of America asked on
ExchangeOutlookActive Directory
7 Comments1 Solution165 ViewsLast Modified:
Fellow experts, I would like your thoughts:
I have a very large 2010 to 2016 migration coming up and while normally I wouldn't have any issues but I see something I'm not 100% sure about.
They currently have 11 Exchange 2010 servers but we'll focus on 4 CAS servers. Two (2) are in each Active Directory Sites.
ADSite1: 2 CAS servers with all URLs (including Autodiscover) is (Autodiscover Site scopes are configured)
ADSite2: 2 CAS servers with all URLs (including Autodiscover) is (Autodiscover Site scopes are configured)
Currently have 2 dags (for mailbox servers in each site). i.e. no copies from one data center to the other.
they also do NOT have Outlook Anywhere Enabled yet (I know this will be required)

Customer is wanting unified name space (under my recommendation) to something like and autodiscover to
I am also planning to do a single dag with copies of databases in each DataCenter.

So, I am planning 6 Exchange 2016 servers (3 in each location).

My question is around getting to unified name space without affecting clients before migrating.
Should I at least enable Outlook anywhere on all cas servers on 2010 and set url to and change the autodiscover on the 2010s to before even installing the first 2016 server?

Or should I match all AD site URLs on the 3 2016 servers in each site to match the 2010 servers in each site then change the 2016 URLs post migration?

my thinking is I would change the autodiscover URLs on the 2010s, install the 2016s with all URLs to and autodiscover to and enable outlook anywhere on 2010 and set that url to (this would be one of the first things I would do even before installing a 2016 server).
Final note, They are getting a UC cert that will cover all of these names and their current cert already has
Join our community to see this answer!
Unlock 1 Answer and 7 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 7 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros