No, you can't change the colors.

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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> Is it possible to change the color of labels used in Outlook Calendar?
> I would like to customize the default colors since I am slightly color blind
> and sometimes the default colors are not obviously distinct from one another.
>
> Thanks!