You can delete a contact that you are no longer using to clean up the address book for new contacts. When deleting a contact, you permanently remove the contact information, and you cannot restore it later.
Procedure
On the Meeting menu, go to the Address Book tab.
If the LDAP Directory feature is enabled, go to the Local Contacts subtab and select Edit.
If the LDAP Directory feature is disabled, at the top of the Address Book tab, select Edit.