The issue was indeed this, and my host fixed by increasing the limit to 20M.
However, now I’m having another problem (I hate beeing a newbie…) When I try to import my wordpress.com blog to the new server I get the message “The uploaded file could not be moved to .”
Do you know why and how it can be fixed? I did download the plugin needed and activated it, but I still get the message when I try to upload the exported file.
Thanks again!