This growing surge in popularity revealed the limits of the initial protocol's scalability.
In early 2001, variations on the protocol (first implemented in proprietary and closed source clients) allowed an improvement in scalability.
This did not stop gnutella; after a few days, the protocol had been reverse engineered, and compatible free and open source clones began to appear.
This parallel development of different clients by different groups remains the modus operandi of gnutella development today.
It's also built into the Netscape and Microsoft Internet Explorer browsers.
POP3 is designed to delete mail on the server as soon as the user has downloaded it.
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