The big Internet service provider will offer 2GB of e-mail storage to users of its AIM instant messaging service.

Users of AIM will be offered the chance to activate their AIM.com e-mail address as the company rolls out the new ad-supported service. Those who activate will be offered an entry into a company-sponsored sweepstakes, with prizes like PSPs, iPod Shuffles, T-Mobile Sidekicks, and a Mini Cooper S.

For those who subscribe to AOL, the company will increase its members’ e-mail storage to an unlimited capacity. They will be the first online service to do so. As part of that change, AOL will enable a new service for dial-up users, Multiple Simultaneous Log-ins.

That feature will let up to seven screen names on an AOL account to sign in from different places at the same time. In a press release, AOL states its members use some 80 million AOL Mail accounts.

For AIM users, the new e-mail service provides spam and antivirus protection at the server level. This makes for more seamless protection against many of the nuisance and harmful messages in the wild.

The e-mail service will be integrated with AIM. Users can send e-mail to a buddy in their list, or reply to an e-mail with an IM. And messages can be “unsent” should a user desire to cancel sending a message that hasn’t been opened yet by the recipient.

A new version of the AIM client was made available today via the web site, for Windows versions 98/ME/2000/XP users. Video IM will only be available to those on the XP platform.

Another service, AIM Blogs, was recently made available to AIM users. That service allows AIM users to create a blog and update it from their AIM client.

David Utter is a staff writer for Murdok covering technology and business. Email him here.