Version 2.0 retained the hard-coded VA checks, but replaced the Shavlik security assessment engine with Microsoft Update technologies which adds dynamic support for all Microsoft products supported by Microsoft Update.
The program is usually updated on the second Tuesday of every month and distributed via Windows Update, at which point it runs once automatically in the background and reports if malicious software is found.
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It is automatically distributed to Microsoft Windows computers via Windows Update service but can also be separately downloaded.
Arie Slob, writing for the Windows-help.net newsletter in March 2003, noted that the size of the update list had exceeded 400KB, which caused delays of more than a minute for dial-up users.
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