Dear Zimbra

pbrunnen,
Most of those old folders are safe to remove. ie: Keep the 2 most recent folder versions/the one symlinked to. You can delete those config.#####, not a whole lot of room freed up on it, but for tidying up purposes.
If you're cleaning out your /opt/zimbra/.saveconfig/ folder however be a little more careful. Sub-folders for old configs is one thing, but I wouldn't suggest removing your current config.save, etc ;)
Those tracking: Bug 23414 - Clean up stale files and folders on upgrade

p24t,
Correct:

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Note: Enhancement and bug requests also funnel in through the same ticketing process.
-snip-
Support Incidents determined to be enhancement requests or bug reports do not count against your allotted Support Incidents.
http://www.zimbra.com/support/support_overview.html

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Good blog article to read: Open Source Product Management: How do features get into Zimbra?

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Originally Posted by p24t

As a NE customer, if there is a bug that my company really wants fixed, I tell support and they add that information to the bug, and it gets a higher priority, yes?

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That's correct.

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Originally Posted by p24t

If so... anyone who really wants those read receipts (I don't) should contact support and tell them.

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That also correct and you can vote on them, OSS users should also vote on bugs/RFEs that they want implemented. Many of the bugzilla entries that people kick up a fuss about have few, or no, votes on them.

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Originally Posted by phoenix

That also correct and you can vote on them, OSS users should also vote on bugs/RFEs that they want implemented. Many of the bugzilla entries that people kick up a fuss about have few, or no, votes on them.

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That's why I like when people post bugs to the forums.. saves me the trouble of trying to do a ninja search on bugzilla. (though I still need to search the forums more myself)