RTM 版。这基本就是最终的版本，英文是 Release To Manufactur，意思是发布到生产商。
Original Equipment Manufacturer (OEM)
You may license products through an Original Equipment Manufacturer (OEM). These products, such as Windows operating systems, come installed when you purchase a new computer.
OEM软件是给电脑生产厂的版本，无需多说。
Full Packaged Product (FPP)–Retail
Physical, shrink-wrapped boxes of licensed product that can be purchased in a local retail store or any local software retailer.
或者说，VLK不是指一种版本，而是指这种版本在部署（deploy）过程中所需要的Key，而需要VLK这种Key的版本应该叫做VOL！只不过在实际中，没有必要强调这种叫法、称呼的准确性，加之很多人的VOL版本光盘是通过企业的选择式许可证、企业协议等方式得到的等等原因，所以才会有很多人叫他为“选择版”等等。
官方网站有一个表格，上面有一句话：“Different products require different Volume Licensing Keys (VLKs). Refer to the table below to make sure you have the correct VLK for your Microsoft product.”，我想这就很好的说明了VLK指的是Key而不是产品了。 很明显的，FPP需要激活，VOL不需要激活。
