Is there a way to add the e-mail and Exchange related tab to existing AD us

Is there a way to add the e-mail and Exchange related tab to existing AD users?

All the AD users account I create after installed Exchange hase 3 additional tabs (e-mail address, exchange…) However, the users account which created in previous still does not have these tabs? Is there a way to add these tab into Users which created previous to install Exchange? Thank you very in advanced.

Mail: Exchange 2003 & W2K3
Domain: Windows 2000 Domain