Authentication Modes supported by Hybrid Deployments

ExchangeOnline444 21

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

KyleXu-MSFT 26,261 Reputation points

2020-11-23T02:24:43.757+00:00

@ExchangeOnline444
Any update about this thread now?

2 answers

Andy David - MVP 147.9K Reputation points MVP

2020-11-19T19:14:56.96+00:00

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
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KyleXu-MSFT 26,261 Reputation points

2020-11-20T01:59:04.887+00:00

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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ExchangeOnline444 21 Reputation points

2020-11-23T07:10:53.127+00:00

Thanks @Andy David - MVP

@KyleXu-MSFT ,
We have an application which is an archiving system wherein we support both Exchange On-Premises and Exchange Online as mail source. Now that we were planning on providing support to Exchange Hybrid, we had this query on authentication mode used by Hybrid system as the underlying mode of authentication in our application uses MAPI libraries.

We could see that Classic Minimal, Classic Express and Modern Minimal topology does not support HMA and OAuth configuration options. In this case, what is the supported mode of authentication?

Even if we choose to implement HWC options that support HMA and OAuth, will that interfere with the underlying mode of authentication i.e. MAPI in our case?

Additionally, we would also like to know, in Exchange Hybrid, how does Outlook client communicate with Exchange server?

KyleXu-MSFT 26,261 Reputation points

2020-11-26T08:46:24.703+00:00

I don’t understand how your application works. But I think the authentication mode between Exchange online and Exchange on-premises doesn't effect the using of application. After hybrid, you could enable the authentication mode that you needed.
Indeed, Exchange online and Exchange on-premises have the archiving function, there doesn't need to use additional tools.

KyleXu-MSFT 26,261 Reputation points

2020-11-30T01:11:03.813+00:00

@ExchangeOnline444
Are the above answers help?
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Authentication Modes supported by Hybrid Deployments

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