I do not experience any problems with my SBS 2011 server. "Fix my network" wizard doesn't any error.
When I open IIS certificates or exchange certificates, I see few expired certs. You can see it on attached screenshots.
Is it safe to remove them?
There are all "CN=sites" certs expired.
Then there are another 3 certs with long subject, something like "CNemail@example.com,
CN=mail.domin.com, CN=something.domain.com, ..."