Forum Discussion
Retiring on prem Exchange server from O365 hybrid while keeping AD sync
Hi All, We have several Exchange/Office 365 hybrid environments and we are now starting to look at retiring the no longer needed on premises exchange server while still retaining AD sync via AAD ...
To start, redirect the mail flow by changing the MX record and rerunning the Hybrid wizard to adjust connectors and such. Once you've confirmed everything is working as expected, you can start the removal process, by following the steps here: https://docs.microsoft.com/en-us/exchange/decommission-on-premises-exchange
As Chris mentioned above, you need to have at least one server for management purposes, that's a requirement for any scenario involving dirsync. If you want to stay in a "supported" configuration, that is.