No "Outlook Mail (Preview). So looks like I haven't received the upgrade.
OK, so you have a different problem. Please use the Ask a question option on the Participate menu to start your own thread about it. Give as many details as you can of what happens, including the full error message and what you were doing when you saw it.
Please say also whether you have the same Microsoft Account set up as a mail account in Windows Live Mail. If you do, it will appear in the folder pane of your mail window (press Ctrl-1 or click the first, Mail icon at the foot of the folder pane). Right-click on the account name in the folder pane and select Properties. At the top of the Server(s) tab, you'll see the type of account - HTTP, IMAP or POP3. Please give this also in your reply.