1) https://www.google.com/a/cpanel/standard/new3
2) add TXT verification to your DNS zone
3) reduce current MX TTL to 600
4) add oldmail and/or oldwebmail DNS records
5) create users
6) login to each user and enable POP/IMAP
http://support.google.com/a/bin/answer.py?hl=en&answer=105694
7) Activate Mail
8) Add MX records
10 | aspmx.l.google.com |
20 | alt1.aspmx.l.google.com |
20 | alt2.aspmx.l.google.com |
30 | aspmx2.googlemail.com |
30 | aspmx3.googlemail.com |
9) client reconfigures mail clients:
https://support.google.com/mail/bin/static.py?hl=en&ts=1668960&page=ts.cs&rd=1
IMAP Client Setup:
https://support.google.com/mail/bin/answer.py?hl=en&answer=75726
POP3 Client Setup:
https://support.google.com/mail/bin/answer.py?hl=en&answer=12103