1. Windows
1.1. Strengths
1.1.1. will support the power-savvy ARM chips found in phones and tablets, in addition to the Intel and AMD chips that have traditionally powered Windows PCs
1.1.2. The popular Metro interface introduced along with the last Windows mobile OS is also coming to Windows 8
1.2. Weaknesses
1.2.1. security issues
1.2.2. fragmentation of operating systems
2. Mac OS X
2.1. Strengths
2.1.1. virus-free reputation that comes with it
2.1.2. brings over a number of popular iOS features, including notifications, reminders, Twitter integration and iMessage, plus synchronization with iCloud
2.2. Weaknesses
2.2.1. requires you to buy basic applications to do every day task
2.2.2. OSX is only compatible with Apple Mac computers officially
3. Ubuntu
3.1. Strengths
3.1.1. smart menu system that easily groups together all your “apps” in one easy place
3.1.2. Virtual Desktops
3.2. Weaknesses
3.2.1. lack of customisability of the user interface and the menu bar at the top
3.2.2. not 100% compatible with a lot of hardware