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Some questions about certificates on an SBS 2011 standard server.  Which are needed? Which should be deleted?

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Last Modified: 2018-10-25
On an SBS 2011 standard server, I was having problems getting a new user working on ios (but outlook 2016 worked fine and other existing users set up fine on the phone)..

I started playing with the microsoft connectivity tester and it was failing with certificate errors.

Troubleshooting some error numbers, I see pages talking about checking the certificates.

Looking in the certificate snap in, there's this user and this machine choices.  looking in there, there's LOADS of certs. some expired. some YEARS away from expiration (affirm Trust Premium ECC with exp 12/31/2040 is the farthest out in trusted root certs), there's trusted root cert authories, third party trusted root certs.  'all' we use the server for is exchange and file server.  Yeah, I use server/remote and server/owa...  the users don't.

Can I blindly delete the expired certs (some I think are self signed) we do have a comodo cert that expires in 1 1/2 years.  There were godaddy certs - I think we had that before the comodo.  and other certs from companies I don't know about.  They come with the server? (again it's  SBS 2011).

And there's untrusted certs like diginotar Root CA G2 expiring in 2029).

Is there a list of what I can / should delete or keep?  Just to reduce clutter? I just know about the comodo cert we bought.  these others? No clue.

THere's a */EFGO.GOV.TR cert expiring in 2021.  We are a US based company / don't do anything with other countries... ok, I see something about google / fruadulent certs and I can / should delete that one?

Do I just google each one to see what I find?  Is there a way to delete all except the comodo and import a current / clean set of trusted root cert authority cert?

THANKS!
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David Johnson, CDSimple Geek from the '70s
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Commented:
Don't forget there are 2 certificate stores -- machine and the per user store. Since you obviously are not familiar with the certificates and certificate stores my suggestion is to not fiddle with them.

We are a US based company / don't do anything with other countries You don't have customers worldwide? You have absolutely no control over other sites and where they source their certificates they could have got a really good price from the hong kong post office CA
David: I'd rather not fiddle with them - a little knowledge is dangerous... But for troubleshooting email cert issues, being obsessive, and wanting (needing) to learn things, I feel I need to deal with this.

Sajid:  Right click the certificate you’d like to remove and click delete

thoughts on which other than expired ones that I should keep /delete? I guess I should list them / screen capture and see if anyoine here sees glaring red flags / ones I should make sure not to touch.
David Johnson, CDSimple Geek from the '70s
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Distinguished Expert 2019

Commented:
Email Certificate issues: the problem is in the email configuration not the certificate store.