Autoformattingi s just part of a custom view - so it can be applied to any
calendar and won't affect anything but the view. So.. yes, it can apply to
one calendar and not the other - just make a new view using a new name - and
no, there are no known issues with it.
To get started with custom views:
http://www.outlook-tips.net/beginner/viewmenu.htm

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Diane Poremsky [MVP - Outlook]
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Coauthor, OneNote 2003 for Windows (Visual QuickStart Guide)
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> When the owner of a public calendar sets up automatic formatting for her
> own
> primary calendar, is it also possible to set up different automatic
> formatting rules that would apply to the public calendar wthout
> interferring
> with her primary calendar? Are there any known issues with this?