This is very irritating to me as I run a desktop and a laptop accessing the same set of post offices using TB on each.  I will "X" out of TB on my desktop and activate my laptop later only to discover the laptop has no new email since the desktop TB was downloading email in its hidden state.
   Please add an option so I can  use the "X" as a QUIT for TB - the current 3 button quit is very awkward as well as unnatural.  I really don't want to set the "Check for new messages" option off and remember to periodically poll for new messages !!!  PLEASE

The Thunderbird action now taken when the X on the upper right mini menu (Minimize, Maximize,Close) treats the "Close" option as a "move to run in background and do not add an indication to the taskbar". Every other Windows program treats this CLOSE as a QUIT/EXIT. Somewhere along the way T-Bird changed its standard action away from the QUIT/EXIT. This is very irritating to me as I run a desktop and a laptop accessing the same set of post offices using TB on each. I will "X" out of TB on my desktop and activate my laptop later only to discover the laptop has no new email since the desktop TB was downloading email in its hidden state. Please add an option so I can use the "X" as a QUIT for TB - the current 3 button quit is very awkward as well as unnatural. I really don't want to set the "Check for new messages" option off and remember to periodically poll for new messages !!! PLEASE