Exchange 2016 on premesis server need a certificate?

Does an on premises Exchange 2016 server that is integrated with Office 365 need to have a public certificate installed (just like how a stand along Exchange server requires a certificate)?
IT GuyNetwork EngineerAsked:
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viktor grantExchange ServersCommented:
Hi,

Yes you need to use third party certificate. In orde to configure a hybrid deployment, you must use and configure certificates that you have purchased.

https://technet.microsoft.com/en-us/library/hh563848(v=exchg.150).aspx

Cheers
Viktor
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timgreen7077Exchange EngineerCommented:
Viktor is correct. you do need a third party cert if you are in hybrid mode.
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Jose Gabriel Ortega CEE Solution Guide - CEO Faru Bonon ITCommented:
Exchange server DO NEED a certificate.

Basically because all the Exchange traffic is using MAPI over HTTP and this need to be "encrypted" using a certificate.

Now, if you are going to integrate with O365 you need to buy an SSL certificate, with at least "2 SAN" (2 urls validated on the same domain). Goddady offers 1 URL or 5 or even more (suffering the COST of those), I have used Namecheap positive SSL wildcard certificates over 3 years without any issues.

About the details of the URL should be:
Mail.<domain.com>
autodiscover.<domain.com>

The 1st is for services like web services, OWA or ECP access.
and the 2nd one is for connecting services Like Outlook Anywhere, Mobile or phones, tablets and outlook clients.
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