operating systems

Now is the development of computer information systems very rapidly, from the initial stages of unders like lotus 123 dos develop into under windows starting from version
1. Windows 95
2. windows 97
3. windows millennium
4. windows xp home
5. windows xp professional
6. windows vista home
7. windows vista professional
8. windows 7 starter
9. windows 7 home
10. windows 7 professional
11. windows 7 ultimate
12. Windows 7 Enterprise

On the other hand also develops the operating system under an open source linux from debian, slacware, fedora, ubuntu and others - others.

Such developments are extremely fast operating system, so we should always learn, and learn so as not to miss, greetings