[citation][nom]pacomac[/nom]What do you do when your email box is full? Personally I think web based email clients are fine for occasional use, but you really need a local backup, especially if like me you get tons of emails and need to keep backups.[/citation]The major webmail services have multiple GB of storage space for free. They also support POP3 so you can still use an offline mail client. The users I was referring to don't have data retention needs that require separate backups. Gmail, Yahoo!, and Office 365 all have highly redundant networks so availability problems are more likely to occur with the ISP, not the webmail provider. Many ISPs don't bother with their own email service and just contract with one of the major webmail providers.