-1 and 0 are the values that Outlook actually stores for Yes/No (Boolean) properties. To print something different, you'd need to code an entire printout procedure. See http://www.outlookcode.com/article.aspx?ID=24

Signature
Sue Mosher, Outlook MVP
Author of Microsoft Outlook 2007 Programming:
Jumpstart for Power Users and Administrators
http://www.outlookcode.com/article.aspx?id=54
>I have created a check box on a meeting request form, asking for items needed
> for the meeting such as a laptop or projector.
> When I print the form out the resulting values for the check boxes are -1
> and 0 for Yes and No.
> Is there a way to change what value is output from the box being check or
> unchecked? Hopefully the actual words Yes or No.