Talk:Compacting folders
From MozillaZine Knowledge Base
Should one recommend doing this only offline? At least in OE, compacting while messages are being downloaded can destroy the whole Inbox, which is why MS has finally got rid of the possibility of having this done automatically ("background compacting").
And if there is no danger of TB corrupting the Inbox by simultaneously downloading and compacting, there is probably a way that at least advanced users would like to automate this via user.js. So far, i've only seen hacks http://forums.mozillazine.org/viewtopic.php?p=994438#994438 to imitate the newer TB versions' function which asks whether this should be done, but doesn't just do it.