It doesn't work because the value of the fields is True or False -- a
logical Boolean value -- not "Yes" or "No", which are string values.
If the new field is a text field, try it this way:
IIf( [SG1Active] = True Or [SG2Active] = True Or [SG3Active] =
True,"Yes","No")
FYI, there is a newsgroup specifically for Outlook forms issues "down the
hall" at microsoft.public.outlook.program_forms or, via web interface, at
http://www.microsoft.com/office/community/en-us/default.mspx?dg=microsoft.public
.outlook.program_forms

Signature
Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> Hi - I am trying to write a simple formula that says if one of these 3
> fields has a check mark
[quoted text clipped - 11 lines]
>
> Ian