Forum Discussion
EOP license for on premises users in a full hybrid
I think you don't need to. According to article https://docs.microsoft.com/en-us/exchange/hybrid-deployment/move-mailboxes#what-do-you-need-to-know-before-you-begin
The Microsoft 365 or Office 365 Exchange license must be assigned only after the migration is complete. You then have 30 days to assign the license.
I think the license is for the Exchange Online mailboxes only once it is migrated. For the mail flow going in-and-out of your on-premise Exchange Server, HCW (Hybrid Configuration Wizard) automatically creates an inbound and outbound connector in Exchange Online Admin Center for your Exchange Server.
Also this might help:
For general overview of Exchange Hybrid, you can refer to https://docs.microsoft.com/en-us/exchange/exchange-hybrid.
For prerequisites of Exchange Hybrid, you can refer to https://docs.microsoft.com/en-us/exchange/hybrid-deployment-prerequisites.
For mail flow, you can look into https://docs.microsoft.com/en-us/exchange/transport-routing.
pazzoide76 Thanks for your question. It's the same question that we need to solve. Becasuse in this Microsoft section are reported that if we need to route the incoming messages throught EOP, we have to purchase a license:
"You may need to purchase EOP licenses for each on-premises mailbox that receives messages that are first delivered to EOP and then routed through the Exchange Online organization. Contact your Microsoft reseller for more information."
Then, in hybrid deploy where we have some mailboxes on the on-premise exchange server, and some others in the Exchange Online. We have really to purchase an EOP license for all users still in the on-premise server, if we decide to point the MX record to EOP? If yes, it's ridicoulus, because we have just purchase a premium license for all users, but as Microsoft said, we add the license only after the user are migrated to Exchange Online.
Thank you for all answers