Why aren SnapMail 4 users visible in SnapMail 5?
SnapMail 5 runs independently of previous versions of SnapMail. You can install the new version, play with it and test it, but still use your current version of SnapMail. While you can import your mail from SnapMail 4 into SnapMail 5, SnapMail 4 users cannot send mail to SnapMail 5 users, or visa versa.