I'm using Thunderbird RC1 and Zimbra M2NE, and when tbird folders e-mails based on its filters, I end up with one message in my inbox and 1 message in the folder that thunderbird wanted to folder it in.
This may have something to do with Zimbra's broken internal filter system, as I had Zimbra filters to do pretty much the same thing as thunderbird, but they kept changing back to "keep in inbox", so I deleted them and actually turned off filters from the administration app.
I think that Zimbra must consider folders just metadata, so I don't think I have two COPIES of the e-mail, but it's still very frustrating.
Ideas? Where are the zimbra filter rules actually stored? Maybe I can make sure they're cleared out.