I have VM (NTL) account, Gmail and Domain Name (running on Google Apps) successfully running on Windows Live mail 2011 using IMAP.
I seem to recall there were a number of settings, here's what I can remember (I just exported a copy of profiles in case needed again).
Select 'Properties' on each account, then the IMAP Tab, ensure 'Store Special Folders on IMAP Server' is selected.
On the general Mail Options tab de-select 'Save a copy of messages in Sent Items Folder'.
There was some problem with the 'All Mail' Folder, which I resolved .. I just can't readily recollect what I did to do it

I think you can right-click on it and select 'Remove' or something along those lines.
IMAP now works very well, would never go back to POP.