This applies to the free Netscape Webmail accounts (bearing the format username@netscape.net), which you can sign up for here, and which gives you a free AIM "Screen Name" as well.
It's still a quarter of what Gmail offers, but not bad, considering that you get pseudo-IMAP access from the Netscape 7.2's e-mail client (based on the Mozilla 1.7x suite)
Do not confuse the free @netscape.net webmail accounts with the paid Netscape-branded dial-up ISP, which provides email accounts ending in @netscape.com.
We'll be awaiting the official confirmation of this storage increase from the Corporation. We'd hate to hear that this was only an "error" like in Gmail's terabyte- storage gaffe earlier this year. µ