We need a plugin for Thunderbird that allows us to add a new column in the messages list (just like Sender, Date, Size, Subject etc.) and where we can fill in a comment for each message (the field to fill in doesn't necessarily have to be in the list, it can be somewhere below or above the message), but the text that we fill should be visible in the messages list as a separate column.
This new column's content has to be shared by more users that check the IMAP account (they are not on the same network). It has to be something similar to the Flag option (ie. everybody else can see when one flags a message, and you can have a column for it to see at a glance which are the flagged messages). Just that it has to be able to hold a short text in it.
Please bid if you can provide this plugin or an alternate solution to accomplish our need.