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My Exchange 2010 server has 3 certificates listed. &nbsp;There are two self signed certs that have the SMTP service assigned, and one from a certificate authority that has IMAP, POP, IIS, and SMTP assigned. &nbsp;We've recently started getting errors in the event viewer that say: <br />
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The STARTTLS certificate will expire soon: subject: server.domain.com, thumbprint: ABCDEFGHIJKLMNOPQRSTUVWXYZ<wbr />, hours remaining, 645. &nbsp;Run the New-ExchangeCertificate cmdlet to create a new certificate.
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I have several questions about this. &nbsp;First of all, why do I have 2 self signed certs that both have SMTP assigned and expire within days of each other? &nbsp;Why is only one of the two self signed certs (the one that expires latest) being alerted on in event viewer? &nbsp;And do I really need either of these, since the cert from the CA has SMTP assigned to it?
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My Exchange 2010 server has 3 certificates listed.  There are two self signed certs that have the SMTP service assigned, and one from a certificate authority that has IMAP, POP, IIS, and SMTP assigned.  We've recently started getting errors in the event viewer that say: 

The STARTTLS certificate will expire soon: subject: server.domain.com, thumbprint: ABCDEFGHIJKLMNOPQRSTUVWXYZ, hours remaining, 645.  Run the New-ExchangeCertificate cmdlet to create a new certificate.
I have several questions about this.  First of all, why do I have 2 self signed certs that both have SMTP assigned and expire within days of each other?  Why is only one of the two self signed certs (the one that expires latest) being alerted on in event viewer?  And do I really need either of these, since the cert from the CA has SMTP assigned to it?

STARTTLS Exchange certificate will expire soon

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

HTTPS is a protocol for secure communication over a computer network which is widely used on the Internet. HTTPS consists of communication over Hypertext Transfer Protocol (HTTP) within a connection encrypted by Transport Layer Security (TLS) or its predecessor, Secure Sockets Layer (SSL). The main motivation for HTTPS is authentication of the visited website and to protect the privacy and integrity of the exchanged data. HTTPS is widely used for protecting page authenticity on all types of websites, securing accounts and keeping user communications, identity and web browsing private.