Decommissioning Exchange 2010 after Cutover Migration

Organization has DirSync and mailboxes only in the cloud.
The current Exchange 2010 is not doing anything (and has been shutdown for 2 weeks to verify)

My question is, If I uninstall Exchange 2010 with Uninstall from Add/Remove programs, will this effect any DirSynced attributes and cause a problem?
K BAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
If the mailboxes are all located in the Cloud then you will not have any issues simply removing the Exchange server from your on-prem environment.

K BAuthor Commented:
Thanks Will!  It does not modify any AD user attributes when you uninstall it?
Vasil Michev (MVP)Commented:
Having dirsync means you need to have at least one Exchange box is you want to stay in supported scenario. Make sure you understand the details as explained here:

If you are fine with managing Exchange related attributes via ADUC/ADSI Edit/PowerShell/whatever and if you are fine with risking Microsoft denying you support in some situations, then yes, all you need to do is uninstall via Control panel or by running setup.exe.
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K BAuthor Commented:
Hey Vasil, thanks for the information! ... but this is not a hybrid deployment.  that article seems geared for a hybrid?
Will SzymkowskiSenior Solution ArchitectCommented:
Ahh.. i just re-read the question and when you have Exchange in a Hybrid scenario and you are using DireSync most of the arrtibutes that you sync to the cloud can no longer be managed. Depending on how your current environment is you might not want to decommission the on-prem Exchange envrionmnent for added functionaility. See the below link for additional details on when/when not to decommisison on-prem Exchange.

my apologies

K BAuthor Commented:
I don't think you misread my question... now you have ME rereading my question LOL.

So, nope this is NOT a hybrid... it was just a simply cutover migration that included DirSync.

They are not huge shop so they have been fine for a couple months using AttributeEditor tab to admin/create users.

So Will, is it fine to uninstall without worrying about effecting any AD attributes for users (then having those changes DirSync into the cloud?) Things like proxyaddresses etc...?

Thanks again!
Vasil Michev (MVP)Commented:
The article is not for Hybrid only, but for every scenario that involves dirsync. Here are the relevant paragraphs:

When directory synchronization is enabled for a tenant and a user is synchronized from on-premises, most of the attributes cannot be managed from Exchange Online and must be managed from on-premises. This is not due to the hybrid configuration, but it occurs because of directory synchronization. In addition, even if you have directory synchronization in place without running the Hybrid Configuration Wizard, you still cannot manage most of the recipient tasks from the cloud. For more information, see this TechNet blog.

The question of whether a third-party management tool or ADSIEDIT can be used is often asked. The answer is you can use them, but they are not supported. The Exchange Management Console, the Exchange Administration Center (EAC), and the Exchange Management Shell are the only supported tools that are available to manage Exchange recipients and objects. If you decide to use third-party management tools, it would be at your own risk. Third-party management tools often work fine, but Microsoft does not validate these tools.
Will SzymkowskiSenior Solution ArchitectCommented:
I had posted my comments before the other posts showed up. When you prep the domain before the first Exchange server is installed it adds thoughs attributes to your AD Schema. These arributes do not get removed when you remove your Exchange server becuase when you perform a Schema update it is irriversible.

So regardsless if you remove Exchange on-prem or not those attributes will still be present.

However, based on what Vasil has stated if you have used DirSync to migrate your mailboxes and you want to stay compliant then you are required to keep the On-prem server.


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K BAuthor Commented:
Thank you both.  My original question was answered by Will and I had NO idea that support-ability was in question - So, thank you also Vasil.
I have called support many times with no problem but can you imagine that one time Microsoft decides to deny you support when you most need it?!
Damien KayCommented:
Another option, depending on your hardware availability, is the Free Exchange 2013 Hybrid license.

A great example would be a relatively small Virtual Server running this free version of Exchange 2013. This would allow you to maintain local management of the Exchange Attributes in a supported environment.
I am assuming there will be a similar license with Exchange 2016 at some point...
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