Score:-1

Reverse hybrid exchange: concerns with adding new on-prem exchange to existing 365 hosted exchange environmnet

ng flag

I am curious to know if there are any major gotchas with setting up a 'reverse hybrid' 365 deployment, where all mail flow is already in the cloud with on-prem ad sync already enabled and simply adding on-prem exchange to the mix. I have found surprisingly little discussion about this online and I was hoping to find out if there are any major concerns with doing this sort of thing.

joeqwerty avatar
cv flag
What's your purpose for this? Knowing that will give us some insight as to how to answer this question.
Score:0
us flag

Based on my research and test, if you haven't deployed on-prem Exchange, there will not be any Exchange attributes(e.g. msExchxxxxx) in local AD.

Besides, after you assign licenses to these synchronized users and install on-prem Exchange, on-prem AD will not fill these Exchange attributes and you will not see this user in on-prem ECP.

And this could also cause the inventory of your on-premises AD Connect domain and Azure AD domain to show incorrect data and conflicting information: Why Use These Methods to Create an Office 365 Mailbox?

To avoid any accidential issue, you'd better complete this deployment by the help of microsoft.

If you want to add a new on-prem Exchange for hybrid and manage these office 365 mailboxes via on-prem Exchange server, you need enable remote mailboxes for them.

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