Outlook 2003 contacts issue

[jorgemartins]

Hi all,
A few months ago my company changed the mail server to Zimbra. Everything was ok until I formatted my PC.
After that, my contacts, synchronized from the server arrived my notebook
with a diferent "internet format" - "send in RTF"
I have almost 1000 contacts.
Does anyone knows a way to change all of them at once to "Let Outlook decide the best sending format"?
Regards,
Jorge