Laurie,
Do you still have access to the old site/server/database? You may want to do a manual backup using PhpMyAdmin (as per
this post) to make sure all the data is there. There is a test feature to warn you of missing data in the latest ListMail release available from the members area. ListMail backup files are simply plaintext MySQL "dumps" of the database data.
To restore: Set up a MySQL database, username, and password on the new host; set up this information in ListMail's config.php; then import your data using ListMail (*.LM) or PhpMyAdmin's "SQL Query" command. If all is done correctly you should be able to login with the OLD/restored password.
The problem with the filename could have been that the extension was lowercase, ie
.lm instead of
.LM. On Linux, filenames are case sensitive.
Regards