Mac OS 9.1
Amazon.com Product Description
Mac OS 9.1 is packed with over 50 new features, including Sherlock 2. Your personal shopper on the Internet, Sherlock 2 not only finds the products you’re looking for, it’s also an easy way to find people, news, and just about everything else on the Internet. OS 9.1 allows you to share your Mac without hassle or worry, securely storing each individual user’s preferences and files for privacy and convenience. It also analyzes your voice and stores your voi… More >>

DO NOT BUY THIS!!!
It is a rip off compared to Panther (10.3)
Rating: 1 / 5
If you want to get some work done erase the forty thousand plus OSX files off your hard drive and install OS 9.2.2. There simply is no reason to let the Unix-Aqua-Next hack job hurt your productivity any more. Sure you won’t be able to run a few iSofts, but none of them are complete solutions and all are riddled with oversights and nasty user interfaces.
This software works on all Macs currently sold by Apple. Unfortunately Apple is threatening to release Macs that will not run anything below 10.3. That and the huge Apple price premium should be enough to discourage the few remaining Mac loyalists into jumping ship.
Rating: 4 / 5
The marketplace company was excellent. I highly recomend ordering from this company.
Rating: 5 / 5
This is an ok operating system now since there is OS X out that took over. If you still have OS 8 you should get this because it is a big jump. If you want to get OS X get 10.2 or 10.3. 10.3 is the latest. If you have a Mac OS 9 you should have 128 Megabytes that is enough for programs and files.
Rating: 5 / 5
Although OS X has eclipsed it in terms of reliability and compatability (and largely caught up in speed), OS 9 is still a great choice if you have older hardware and don’t need the most recent software. Even though it is based on the original Mac OS that was released in 1984, OS still holds its own compared to Windows. My opinon: if you have at least a 500mHz G3 or any G4, and at least 256MB of RAM, then you will be very happy with OS X (10.2 or above). If not, then 0S 9 is the way to go.
Rating: 4 / 5