Mail.app for life!
Webmail sucks as all it did was turn people lazy. I remember before GMail, everyone knew how to configure their own email, whether they had computer smarts or not...stupid Gmail, the worst thing to happen to E-mail.
Also what it did was cause people to have to CHECK their email, instead of what happened before, when people just left their email client open, and it notifies them of email instantly.
As for the different computers problem, use IMAP, not POP.
I wonder if this is the same crowd who goes to check their email using webmail on their iPhone instead of configuring Mail.app