Top definition
The most prolific source of computer trojans online, frequently euphemized as Windows Update.
Windows Downdate frequently prompts the user to "update" Windows/MSN Messenger to version 4.7 even though version 6 or 7 is already installed.

After installing SP2, Windows Downdate wanted me to update a bunch of things that I updated before SP2, so I don't know if SP2 downdated them, or if Windows Downdate wanted to downdate them after SP2 updated them.
by Downstrike September 14, 2004
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