How to import mail from a Linux program

Here's my question.  I have e-mail stored in my gmail account that is labeled -- that is, they're subfolders of my mail gmail storage.  I also have these e-mails stored in both Evolution and Thunderbird.  I want to import these to outlook.com, and cannot figure out how to do it.

I'm a book review editor, and I have a folder called "Book Reviews" where I store all of my email related to book reviewing.  I need to create a Book Reviews folder in outlook.com and import all of those mails.  Since outlook.com does not support linking to Gmail through IMAP (yuck!), I'm forced to find another way to do this.

So, I guess two related questions:

1.  How do I get this done?

2.  Alternately, is IMAP support coming for outlook.com?  This, of course, would be the ideal solution.

Thanks.