I did check the wiki and saw that. However, this appears to maybe be easier than I thought. I just logged in via FTP, did a filter -a to view the subfolders (which all start with a .) and then downloaded them. I think I can just upload all my mail to the server. I'll post back when I find out.
That will work for FTP users, not so sure how to do the M1234567 type. But since the majority of my mail users also had FTP, this should be mostly easy.
Support can probably help me get the m-user mail.
This whole thing really sucks. I'd rather not leave at all, but my business relies on sites being up. shrugs
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