Assigning Services to Certificates in Exchange 2010

I am running Exchange Server 2010 (14.01.0438) on Windows Server 2008R2.  My Event Viewer has some warnings and errors in it that I was trying to look up.  Some of my certificates are expired.  No big deal.  I have some valid ones, including the 3rd-party one that I use for IIS.  So I guess I want to delete the others.  My only concern is that one of them says that it has the SMTP Service assigned to it.  Another certificate, the self-signed Microsoft Exchange certificate, also has the SMTP role.  That self-signed certificate also has the IMAP and POP services, which no other certificates have, but I don't think we actually use anyway.  So I have a couple questions:

1.

What is standard practice for assigning Services to certificates?  Is it usually the self-signed Exchange certificate for everything except IIS?  Or should I try to use my 3rd-party cert for everything?

2.

Do I need to remove the SMTP service from the expired 3rd-party cert before I delete it?I have attached a screenshot from the EMC if that helps.  Thanks.
Exchange-Certificates-2.JPG
silver1386Asked:
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silver1386Author Commented:
I have made the change.  Thanks for your help.
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