Connect CRM 2016 (On-Premise) to Exchange Online

Hey all,

We are moving from our Exchange On-premise to O365 exchange Online and we were having trouble connecting crm to exchange online.

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Right now we are just trying it out with our test CRM server, but the documentation provided by Microsoft is confusing.

Can someone explain the x509 certificate and how/where to get one.

Also, my boss wanted to know how Exchange Online communicated with CRM, do we need to configure our firewall to allow it to communicate?

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I contacted Microsoft 365 support but they said I had to use Dynamics 365 Support, but they don't have one that works for my situation.