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Azure AD Connect and "Exchange hybrid deployment" write-back
At a management level, one of the assumptions (correct or incorrect) when opting for Office 365 was that synchronization would be one-way (from our Active Directory to the Office 365/Azure). Unless o...
Why the need not to writeback?
If you have mailboxes both and in 365, you'll want that writeback enabled.
For example the legacyExchangeDN of a moved mailbox is written back as an X500 address on-prem to the remote mailbox .
If you dont have that, its going to cause issues for your Outlook clients with cached values and public folders.
Those Attributes write up to AzureAD/365 because all your changes should happen onprem :P. But he's referring to not having any users in 365 yet. In that case I don't see a requirement. But as you start adding any kind of Office 365 groups or anything of that nature you are definatley going to want a hybrid setup.
Yep, I was responding to his comment "Is selecting this optional feature... mandatory... for Exchange hybrid environments?"
- Ahhh, 10/4 :)