"HJ" wrote in message
...

When I try to enter a new contact in Outlook 2007, I get the error message:
"Could not complete the operation. One or more parameter values are not
valid." I am able to revise and save existing contact information. I am
working offline, if that makes a difference. Does anyone know how to fix
this?

I'd try clearing the forms cache.
http://www.howto-outlook.com/downloa...formscache.htm
--
Brian Tillman [MVP-Outlook]