In drop-down folder lists, displayed by clicking the "File" button, the last button "tool tip" that was displayed ("Get new messages", "Create a new message", etc.) is redisplayed on mouseover of any folder name at a position relative to that of the folder name.
David Merrill, if you agree this is a dupe, please mark this bug Verified. *** This bug has been marked as a duplicate of 147670 ***
Confirming that 147670 is indeed a duplicate of this bug, and that it is still true in version 1.3.