That's unfortunate for sure, but if you have the GoDaddy certs why not just reinstall them?
The wiki lists the techniques for doing this via both the Admin Console and the commandline. We have seen this before ourselves, and while I am not trying to be an apologist for Zimbra, "it is what it is".
Post again if you have problems reinstalling the cert.
Also, when you categorized your support request, if you use the redirect method for users to log in, you are effectively down and IMHO would be entitled to U2 level support.
Hope that helps,
Mark
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___________________________________ L. Mark Stone, CIO  "Uptime. All the time."
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