Sorry, for the late reply. Had other work things going on. Well the company we're trying to set this up for HAS Microsoft Exchange Servers, but not all the employees have email. Now the reason I need this "instant messenger" or something related to is, for the acknowledgement. The "managers" need to see that if, they message to another employee or manager, they can get an acknowledgement or read stamp back. Something along those lines. Its so that they can keep tabs on whether they read it or not.
Sorry for all the confusion.