A little follow-up to my earlier post on Populating Users in Office Communicator / LCS. If you want to delete a contact for all users (E.g. for a employee leaving the company) - you can remove the /contactsgroup parameter and instead use the /delete paramater e.g. -
cscript LCSAddContacts.wsf /usersfile:contacts.txt
/contactsfile:delete.txt /delete (Wrapped for readability)
The syntax of the contacts.txt and delete.txt input file is -
Check my earlier post for further info.