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Please find the below link for the steps to renew your exchange certificates.<br />
<br />
<a href="http://exchangepedia.com/2008/01/exchange-server-2007-renewing-the-self-signed-certificate.html" rel="ugc">http://exchangepedia.com/2008/01/exchange-server-2007-renewing-the-self-signed-certificate.html</a>
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Please find the below link for the steps to renew your exchange certificates.

http://exchangepedia.com/2008/01/exchange-server-2007-renewing-the-self-signed-certificate.html [http://exchangepedia.com/2008/01/exchange-server-2007-renewing-the-self-signed-certificate.html]

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ALL<br />
<br />
i'm getting the following message on my exchange 2010 server.<br />
<br />
Log Name: &nbsp; &nbsp; &nbsp;Application<br />
Source: &nbsp; &nbsp; &nbsp; &nbsp;MSExchangeTransport<br />
Date: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3/18/2013 9:07:02 PM<br />
Event ID: &nbsp; &nbsp; &nbsp;12018<br />
Task Category: TransportService<br />
Level: &nbsp; &nbsp; &nbsp; &nbsp; Error<br />
Keywords: &nbsp; &nbsp; &nbsp;Classic<br />
User: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;N/A<br />
Computer: &nbsp; &nbsp; &nbsp;MAIL.domain.local<br />
Description:<br />
The STARTTLS certificate will expire soon: subject: remote.[server].com, thumbprint: EC4B5989B3753FA2C095356F9F<wbr />E887421FCA<wbr />EFCC, hours remaining: 276. Run the New-ExchangeCertificate cmdlet to create a new certificate.<br />
Event Xml:<br />
<br />
What is the proper steps to renew?l <br />
How can I tell if this is a Self-sign cert or a CA Cert?
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ALL

i'm getting the following message on my exchange 2010 server.

Log Name:      Application
Source:        MSExchangeTransport
Date:          3/18/2013 9:07:02 PM
Event ID:      12018
Task Category: TransportService
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      MAIL.domain.local
Description:
The STARTTLS certificate will expire soon: subject: remote.[server].com, thumbprint: EC4B5989B3753FA2C095356F9FE887421FCAEFCC, hours remaining: 276. Run the New-ExchangeCertificate cmdlet to create a new certificate.
Event Xml:

What is the proper steps to renew?l 
How can I tell if this is a Self-sign cert or a CA Cert?

Certifiricate Expiring

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.