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Caspar-3353 asked KyleXu-MSFT commented

Is it possible to run Microsoft Hosted Exchange 2010 in coexistence with Exchange 2016?

So we have a customer that still runs Microsoft Hosted Exchange 2010, so it's not your traditional standard server. Does anyone know if it would be possible to install a second Exchange server in the network and setup coexistence between the two? The goal is to temporary be able to setup this Exchange 2016 server as a frontend for mobile devices and Outlook to connect to while leaving the mailboxes on exchange 2010. In the mean time most of the companies hosted on this server will migrate to a completely new domain with a new Exchange 2019 server or Office365. So the purpose is a temporary frontend server for port 443 and 25. I have not found anything about this online so I assume this is not possible or supported. We have setup coexistence between two servers (Exchange 2010 Standard and Exchange 2016 Standard) but not the Hosted Exchange version.



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KyleXu-MSFT answered KyleXu-MSFT commented

@Caspar-3353

Microsoft Hosted Exchange 2010

Do you mean this one? Exchange 2010 SP1 Information for Hosted Service Providers

Exchange 2016 only supported coexist with Exchange 2010 SP3 RU 11 and later. It cannot coexist with Exchange 2010 SP1. So, even if you can create a new machine(you may cannot create new computer in that domain), you still cannot install exchange 2016 to coexist with Exchange 2010 SP1.

In this situation, I would suggest you create a new domain and create Exchange and mailbox in it, then contact your provider to export mailbox data from hosted Exchange server, after that import data to mailbox on your new Exchange server.

By the way, Exchange 2010 reached its end of support on October 13, 2020, I would suggest you try to migrate data for better security.


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Hi, in our case we have this Exchange 2010 server fully patched to SP3 rollup 32 (March 2021). But the main thing is that this server is the Hosted Exchange version. So it has active directory separated companies that cannot access each other.

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Could you provide more detailed information about the "Hosted Exchange version". Is it a special version of Exchange server? Or the Exchange server that installed on Azure VM?

If it is a special version of Exchange server, I think you may need to contact the administrator of it, he may could provide detailed suggestion to you. Otherwise, we may need to export and import data from the Outlook client.

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I think we will have to try this out in a test environment. There are two versions of Exchange 2010, "Standard" and "Hosted". The hosted version installs Exchange in a different way into the Active Directory. After that you can create separate companies with OU's that cannot access each other. Every OU or "company" has it's own administrator account that can manage only those mailboxes belonging to that company. Also there is no option to share or set Full Access from mailbox in company A to company B. They are fully separated.

This exchange version is very rare it seems and there is hardly any documentation to be found. We will try it in a testmachine see what happens.

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