Funny you should mention this issue; I saw that happen on my own account yesterday.
I chalked it up to me putting my laptop into suspend while Firefox was still logged in to Zimbra. After coming back to the office and opening the laptop lid, each time I opened a new Firefox tab and navigated to the Calendar I got another "duplicate" personal calendar listing on the left, and all of my appointments were "duplicated" as well.
I logged in from a different workstation and saw no "duplicates".
So, on my laptop, I logged out of Zimbra, closed Firefox, opened Firefox and cleared the cache and cookies, and the problem went away.
Running SuSE-provided Firefox 3.0.8 on OpenSUSE 11.1 if that helps.
If anyone else sees this, I'll try to reproduce again and file a bug report.
All the best,
Mark
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___________________________________ L. Mark Stone, CIO "Uptime. All the time."
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