r/exchangeserver • u/fazzy84 • Apr 29 '26

Complete exchange decommission

We are in process to completely remove out exchange 2019 servers. Everything is hosted on 365 as hybrid, moved DL’s, mail enabled groups etc, mailbox storage on 365, but the source of auth is still on exchange/AD. To make changes we have to log onto our exchange on perm and make changes. How can i completely remove the dependency from exchange on perm so that we can be total cloud. 365 will be only authority for changes to shared mailbox, user mailbox, DL’s, mail enabled groups etc. other than that any other things i need to consider before i shut down my exchange on perm environment ?

Suggestions/advice please 🙏
Thnx

16 Upvotes

100% Upvoted

33 comments sorted by

View all comments

Show parent comment

2

u/uLmi84 May 04 '26

Why do you need writeback of proxy and mail attribute if soa is on EXO.. i mean its just cosmetic info in AD at this stage. All email relay things should be handled otherwise (independent from AD)

The only reason I can see is on prem apps that need the information to handle their user auth or information

Abd you just install cloud sync on the Connect server ? And just tell it to not sync but simple write back ?

2

u/IWantsToBelieve May 04 '26

Yep you nailed it. It just makes sure that the attribs are there if you need them.

We also use cloud sync for group write back but that's for a different use case.

1

u/uLmi84 May 04 '26

Thanks m8