when I try to export my MT entries (entreis of 8 yrs) i got exported only part of them, the ampunt is different in every try. i have 2666 entries (many of them with pics) and over 6000 comments.
(trying to post here gives me error many times, just need to go back and send again, this is not normal).
9 times out of 10, this is a CGI timeout (meaning, your host is stopping it because it is taking too long to run).