Windows Live OneCare (formerly Windows OneCare Live , codenamed A1 ) was a computer security and performance enhancement service developed by Microsoft for Windows . A core technology of OneCare was the multi-platform RAV (Reliable Anti-virus), [1] which Microsoft purchased from GeCAD Software Srl in 2003, [2] purpose discontinued. [3] The software was available as an annual paid subscription, which could be used on up to three computers.
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