Windows operating systems can generally be obtained in two ways: in a retail box, or as an OEM (Original Equipment Manufacturer) disc. There are advantages and disadvantages to buying an OEM disc instead of the retail version of Windows.
Pricing
The primary advantage of buying OEM is that the cost is much lower. You can expect to pay as much as half the cost of a retail copy of Windows Vista as of 2009.
OEM Linked to Hardware
However, an OEM install is tied to the computer's motherboard. If you ever replace the motherboard, your license is no longer valid and may be revoked.
Retail Not Linked
The retail version allows you to make as many changes to your hardware as you like, although you may be required to verify your license with Microsoft if you make a large number of changes in a short amount of time.
Getting Support
Another issue is customer support. You can contact Microsoft if you have problems with the retail version. However, the OEM version can only be supported by the vendor from whom you purchased it.
32-Bit and 64-Bit
The retail version of Vista includes the 32-bit version and the 64-bit version. OEM Vista only includes one of these types. If you get the wrong OEM version, you cannot return it.
Tags: retail version, version Vista, Windows Vista, your license