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Ref this post in EE for the fix..it works well,<br />
<a href="https://www.experts-exchange.com/questions/23803894/Expired-SSL-certificate-Can't-renew-button-greyed-out.html" rel="ugc">https://www.experts-exchange.com/questions/23803894/Expired-SSL-certificate-Can't-renew-button-greyed-out.html</a><br />
<a href="https://www.experts-exchange.com/questions/22701660/IIS-snap-in-and-server-certificate-button-unavailable.html" rel="ugc">https://www.experts-exchange.com/questions/22701660/IIS-snap-in-and-server-certificate-button-unavailable.html</a>
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Ref this post in EE for the fix..it works well,
https://www.experts-exchange.com/questions/23803894/Expired-SSL-certificate-Can't-renew-button-greyed-out.html [https://www.experts-exchange.com/questions/23803894/Expired-SSL-certificate-Can't-renew-button-greyed-out.html]
https://www.experts-exchange.com/questions/22701660/IIS-snap-in-and-server-certificate-button-unavailable.html [https://www.experts-exchange.com/questions/22701660/IIS-snap-in-and-server-certificate-button-unavailable.html]

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Hi,<br />
I am trying to renew a certificate on iis 6 so we can get the Exchange Push email happening. The problenm I have is that the Server certificate button is greyed out. I have followed the instructions in the <a href="http://support.microsoft.com/kb/306667/en-us" rel="ugc nofollow">http://support.microsoft.com/kb/306667/en-us</a>&nbsp;article however the button remains greyed out. 
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Hi,
I am trying to renew a certificate on iis 6 so we can get the Exchange Push email happening. The problenm I have is that the Server certificate button is greyed out. I have followed the instructions in the http://support.microsoft.com/kb/306667/en-us article however the button remains greyed out. 

renew cerificate iis 6

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.