In my old Suite mailbox, "All Mail" shows 156,912 messages. I exported them with GYB.
Using the closest thing I can find to count the message on disk shows 161,956:
findstr /s /B "From " *.* | find /v "" /c
(it's counting "From:" lines, too, even though I specified a space in the pattern)
When I went to import them, it showed a progress bar of "X of 151,710", so it seems that I've already lost 4% of the messages.
After the import finished (about 3 days!), the new gmail "All Mail" shows 56,646 messages, so I've lost 64% of the original email.
I'm using the restore command from the doc:
Any ideas on how to get a complete restore, and perhaps do it in less time?