2,311 questions
You would need to enable the Exchange Hybrid option in Entra Connect:
msExchHideFromAddresslist with Azure AD Connect - Schema update or not?
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Stijn Delen
0
Reputation points
Hi,
We have on premise Active Directory, never had on premise Exchange so we are missing the msExchHideFromAddresslist attribute on the user object. Azure AD Connect is up and running. We are not able to change the Hide From Address List option in Microsoft 365 Admin Center or Exchange Admin Center.
I have read that extending the on premise AD Schema is an option to solve this issue, if needed in combination with adjustement of the Azure AD Connect Synchronisation Rules. But is this really needed?
When using the Synchronisation rules editor I can see that the msExchHideFromAddresslist attribute is listed only in four Out to AAD Synchronisation Rules. These are outbound. The msExchHideFromAddresslist is not listed in any inbound rules. Is it an option to uncheck the msExchHideFromAddresslist attributed in these rules? What is the effect of this? Will it make the Hide From Address list option in Microsoft 365 Admin Center or Exchange Admin Center editable again?
Kind Regards
Exchange | Hybrid management
2 answers
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Andy David - MVP 157.8K Reputation points2025-06-03T13:06:26.8066667+00:00 -
Stijn Delen 0 Reputation points
2025-06-03T13:21:05.8066667+00:00 Hi,
Thanks for the reply, but why would I need to hybrid exchange setup if we are not running an on premise exchange? There is also no need to sync the Hide from Address list option from AAD to AD
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Andy David - MVP 157.8K Reputation points
2025-06-03T13:31:22.9866667+00:00 Well its not supported to not have a onprem Exchange Server when syncing unless you have met all the requriements:
https://learn.microsoft.com/en-us/exchange/decommission-on-premises-exchange
Otherwise, you would prob have to extend the Schema on-prem for Exchange and create a custom rule in Connect:
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Stijn Delen 0 Reputation points
2025-06-03T14:15:41.0733333+00:00 Strange, how can I decommision an on prem Exchange that has never existed ...
So I would need to extend the schema to get the attributes or use an existing unused attribute in AD and map it to the msExchHideFromAddresslist on AAD in a sync rule.
But I still would like to know if the following simple action could solve this problem.
Is it an option to uncheck the msExchHideFromAddresslist attributed in the Out to AAD - User ExchangeOnline rule? What is the effect of this? Will it make the Hide From Address list option in Microsoft 365 Admin Center or Exchange Admin Center editable again?
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Andy David - MVP 157.8K Reputation points
2025-06-03T15:21:25.1133333+00:00 It should still be blocked if the accounts are synced from on-prem.
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