Here is what I need. Looking for a company server based POS that has
the Appointment Book and the Client Invoice on the same screen, this is
a must!I need this POS to be able to click and load client Info right from
there appointment,to the Invoice where at that time I can click the SKU#
for services provided and finsh the check out.One other must,It has to
keep track of missed appointments. And finish up with the back end accounting.
This will be used in a doctor/spa style business.

Would the new microsoft accounting program do the trick? Microsoft
Office Accounting Express 2007 is a free 200meg download that's
designed to integrate with the other MS Office programs, including
business manager, word, excel, & outlook. It can also integrate with
PayPal, so you could process credit cards through that, maybe.

Google 'microsoft accounting express' for lots of links/reviews.