... once your account is upgraded to the new Outlook.com, you will NO LONGER be able to send or receive Outlook.com email from Windows Live Mail 2012."
That is patently not true. I have been using two upgraded accounts for a year now, using POP3, IMAP and (after installing the update) EAS. So far as I am aware, the only change coming 'in late June' is that users currently accessing their accounts via DeltaSync will see them upgraded to Outlook Mail. These accounts have so far been embargoed, along with several others, but now the embargo is being lifted.
... neither IMAP or POP works for me ...
Both work for me. POP3 without fail, but IMAP needs treating gently. My IMAP account is the one I use to receive notifications about posts in this forum; with about 10,000 messages in my Answers folder, it might take up to a minute to synchronize all my folders. Its performance is in fact smoother than both a GMX IMAP account and a Gmail account, and not noticeably different from that of a couple of Outlook.com accounts. It is also much better than EAS, because there was so much work left to do on update KB3093594 before they decided to abandon it.