In August 1996, it began a free e-mail service — a customer would install the proprietary Juno client which would allow them to send and receive email of about 35 kilobytes in size.

[citation needed] In June 1998, Juno expanded its service to offer premium support for paying subscribers, and added the ability to browse the web in addition to use of email.

Juno later imposed limits on how much usage could be made of its free Internet service in a single month.

[2] With the collapse of the 1990s Dot-com bubble, Internet advertising revenues declined and the company shifted emphasis to offering discount Web and mail services similar to large ISPs, but at half the price.

[citation needed] Juno released, along with NetZero, a service that purported to make web browsing faster.

By continuing to use the service, customers implicitly agreed to allow Juno to harvest any unused CPU cycles.

[3] The plan was to assemble a quasi supercomputer using customers processors and sell computing services to private companies.

Though a customer for the Juno Virtual Supercomputer service was announced,[5] it remained unclear, as of the middle of July 2015, whether the company followed through on this plan.

[citation needed] Version 5 added an ineffective integral twit/spam filter and the ability to write messages in chosen fonts and colors with inline images.

No version of Juno's offline mail reader was made to use third party utilities to scan for viruses or clean out E-mail spam among messages that had already been downloaded.