No, there mustn't. Renaming a standard view would make it no longer a standard view and would doubtless break other functionality. You can edit the view settings, though, so that Day/Week/Month has autopreview turned on.

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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
>I want to rename the Day/Week/Month w/autopreview as just Day/Week/Month
> (deleting that view first). This is because an add-in product (planplus)
> uses that view as default and won't let me change it to my favorite view
> which is autopreview. I can't delete or rename any standard view. There
> must be some way to do this.