What are the symptoms of an expired "Microsoft Exchange Server Auth Certificate"

[Caspar-ABO]

So I recently inherited an older Exchange 2013 Standard server (fully patched)I noticed that the Microsoft Exchange Server Auth Certificate has been expired for a long time.There are no complaints or any issues reported by the users but I have noticed a few things and I wonder if they are related.I know how to renew this certificate but I wonder if anyone knows what kind of symptoms you would see if such a certificate has expired?What I noticed myself is some users, not all, get a message that the server is unavailable if you want to set an Out of office replyI also noticed that in Outlook, so

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