Get to the Live email support forum to report yet another issue. Here my advice is to change email apps.
when you export in windows live mail you can choose between "all maps" or "selected maps"
in the list of "selected maps" there is no imap map: thus this mean there is no imap map exported when you choose "all maps"?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic