Opening a link within a Microsoft application (MSN Messenger; Outlook Express; Outlook; Windows Update) will open Microsoft's browser (IE).
You cannot remove IE from XP due to their inextricable natures.
You can
Turn Off IE via Control Panel | Add/ Remove Programs | Add/ Remove Windows Components
I assume this will just give your links a DNS error.
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As to Firefox: I've been using it for many months but started to realise how much slower it was than IE. (I discovered this by having IE open via e-mail links btw). I noticed thru TM that Firefox was running idle @ 10% whereas IE runs idle @ 1%.
Also during a debugging lesson from
joehobart he introduced me to a
net meeting format that required IE. It is hard to describe but it brought out the powerfull nature of IE.
I have simulated Firefox's
Tabbed Browsing by opening multiple instances of IE. With no extra CPU usage btw.
Anywho I am back with IE &
All Critical Updates !!!