How to change the area code Outlook auto adds to phone numbers.

[Guest]

Outlook has started automatically adding an area code to phone nos. entered
in Contacts without the code. How do I turn this off or change the default
area code it enters?

 

[Brian Tillman]

Outlook has started automatically adding an area code to phone nos.
entered in Contacts without the code. How do I turn this off or
change the default area code it enters?

In Control Panel's Phone and Modem Options, for Windows XP.