Oh yes, Snow Leopard, sorry
You are going to have to enter the account in Mail manually:
To enter the account manually go to Mail>Preferences>Accounts, click the + sign, enter your .me email address and password, press the option key and click 'Continue',
enter the server settings below.
If your password does not meet these requirements change it so that it does:
Minimum of 8 characters, including at least 1 uppercase letter, 1 lowercase letter and 1 number, no special characters.
Verify that you are using the correct server credentials:
IMAP (Incoming Mail Server) information:
- Server name: imap.mail.me.com
- SSL Required: Yes
- Port: 993
- Username: example@me.com (use your @me.com address from your iCloud account)
- Password: Your iCloud password
SMTP (outgoing mail server) information:
- Server name: smtp.mail.me.com
- SSL Required: Yes
- Port: 587
- SMTP Authentication Required: Yes
- Username: example@me.com (use your @me.com address from your iCloud account)
- Password: Your iCloud password
Note: If you receive errors using SSL, try using TLS instead.
Additional Information
SSL is required for both IMAP and SMTP connection with iCloud. POP is not supported by iCloud.