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I've used ZA for a long time with DSL and dialup connections. NO, it does not become part of your OS. You can uninstall with no problems at any time. My speed is the same with or without it, so I can't see where it slows your connection.
ZA's Mailsafe has kept me from opening unsafe emails with a good warning.
Zonealarm has been recommended by alot of people on this site. For "FREE" protection, it can't be beat.
Carl
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