While attaching Business Cards within Outlook 2003/2007, certain fields get stripped off during the attachment process. Only Home, Business and some other details are trasnferred. Fax, and Notes get stripped off. This is normal as Outlook has two options to send Contacts.
The default method sends only the necessary information (ofcourse you do not get to decide what is necessary though). The other option lets you send the full contact with all fields intact. So you are kind of stuck in the middle.
To send full details, right click the contact and select the option “Send full Contact” including notes.
The most recommened format is to send in Internet Format (vCard), as your recipents may be using different versions of Outlook or completely different e-mail client.
