Nobody reads message boxes. They are so plain Jane. Even if you spice things up with KiXforms and RTF or HTML, chances are they will just hit the X in the corner.
IMHO logon scripts should be 100% silent and invisible, but hey, some admins like to show off their coding prowess. Go for the gusto and get Merlin to fly around the screen and announce your message with speech.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
