I want to write a program to import a single email into an outlook.com account and have it appear immediately.  I want to be able to repeat this process.  I have the message on my desktop as a .eml file - could convert to .msg format if that makes any difference.

If outlook.com supported IMAP I could use the IMAP append feature.  Exchange Active Sync does not appear to allow importing messages into the inbox.  Other options like retrieving mail from another account seem like they would work but there is a delay in those processes - sometimes several minutes.  I want to run my program, refresh my browser, see my message.  

What are my options for making this happen?