Exchange 2010 Assigning services to Certificate

We are completing our first year on Exchange 2010 and it is time to renew our certificates. The certs have been created and imported onto the cas servers. My questions are about assigning services to the new cert.

When we assign the services to the new cert , how does that effect the existing cert? If 2 certs have the same services assigned to them, will that cause a problem? Are we supposed to remove the old cert once services are assigned to the new cert? Would leaving the old cert in place cause problems?
Eddie CrosbyAsked:
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tshearonCommented:
You should remove the old cert. Also, when you assigned services you should have gotten a message about overwriting the old certs config. Finally you can easily check which one your getting when you launch owa. Just click on the little secure lock in the browser and check out the cert.
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Eddie CrosbyAuthor Commented:
Thanks for the info. Another question. Can this be done online in a production environment without causing service interruptions?
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tshearonCommented:
Well it is always better to do it in a test environment first if you have that capability. There is always the possibility for service disruptions when messing with SSL certs. However, if you planned the cert correctly and installed it correctly then you should be just fine. To be safe I would do during the time of day when Exchange connections are at its lowest level.
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