copy account question

Hi ,

I have few question.

1. Will it work if i am using WHM 10.x Mailbox and i have install WHM11 in new server then copy it , will all email under mailbox will auto up to WHM 11 maildir?Any Email miss?

2. I have directadmin , i try copy account from there, but find there have two problem.

A. under public_html file no copy , only all email under DA will copy to new cp11 server.

error >> DA Copying homedir.............
...............
cp: cannot stat `/home/support//home/support/public_html': No such file or directory

B. MYSQL copy but error.

Thanks.

3. My Old server cpanel is php4 + mysql 4.0 New server have php4 + 5 + mysql 5.
Any one know any problem of mysql for this upgrade?

Thanks.:D