1940: The first computer was made.
1950's: Computers used vacuum tubes.
1960's: Computers using vacuum tubes were replaced with transistor-based electronics.
1970's: Integrated circuit technology was introduced to computers.
1980's: Computers were made much smaller.
1980's: First personal home computers were made.
1990's: The Internet and email were developed.
1995: Windows 95 was released.
2000: Windows 2000 was made and released.
2007: Windows Vista was released.

Sources from:
http://www.wikipedia.com/