Don't know if this is some weird interaction between Thunderbird and Zimbra or what, but I have some messages that I tagged as "Important" because I needed to reply to them (the red color on the whole message makes it stand out better than the little flag icon). So after I replied, I went to remove the tag, and found that the checkmark wasn't there in the popup menu. After flailing around a bit, I discovered that if I picked it from the menu again anyway, it added the checkmark. Picking it again after it was checked removed both the checkmark and the color coding.

Not entirely sure if I'm having the same issue or not. I have messages tagged as 'important' from thunderbird 1.5. These "tags" are somehow stored with the message on the LDAP server, so that they automagically reappear when fetching the folder with TB2.0 (nifty, IMHO) It seems that any messages tagged as such cannot have this tag removed if another (new) tag is added to the message. For example, I created a new tag called 'passwords' and started tagging messages with it, and untagging them 'important'. When I navigate away from the message (mousewheel or keyb arrows) the 'important' tag goes back to being 'on', so now the message is 'important' and 'passwords' The only way around this seems to be to clear all tags first ('0') and then tag the message like I want it.

I believe this is fixed in nightly 2.0 builds. Resolving as dup - please re-open if a nightly build doesn't fix this for you. *** This bug has been marked as a duplicate of 348752 ***