Well.. Gmail and Ovi-Mail Support IMAP.

So my work-around for hotmail/yahoo is using the 'Get mail from other account' feature in Gmail.

So basically, all my hotmail messages will be displayed in Gmail. And since Gmail supports IMAP, syncing between the mail on the server and the mail on the n900 shouldn't be a problem.

This is quiet sad, considering that Hotmail was in the email business for a long time, yet they have no support for IMAP.