Authentication Modes supported by Hybrid Deployments

Question

Hi Team,

We are planning on implementing Hybrid Support in our existing application that supports both Exchange Online as well as Exchange On-Premises. Currently we are using MAPI library for authentication. Hence we wanted to know if OAuth is mandatory for Hybrid Deployments.

Thanks

Answer 1

Not mandatory, but you will lose some functionality if note implemented with Classic Exchange Hybrid:

https://learn.microsoft.com/en-us/exchange/using-oauth-authentication-to-support-archiving-in-an-exchange-hybrid-deployment-exchange-2013-help

If you are referring to HMA, then its absolutely required:

https://learn.microsoft.com/en-us/microsoft-365/enterprise/configure-exchange-server-for-hybrid-modern-authentication?view=o365-worldwide

Answer 2

implementing Hybrid Support in our existing application that supports both Exchange Online as well as Exchange On-Premises

What do you mean by this sentence? What is the version of your Exchange on-premises server?

If you want to use HCW to create hybrid. AndyDavid's suggestion will be the suitable one for your question.

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