Sometimes companies will use a Windows volume license to install Windows Professional edition software on more PCs than are allowed. For instance, Windows volume licenses require an existing qualifying operating system pre-installed as a pre-requisite on each PC. In most cases, this means a Professional-level operating system is required. Microsoft and our trusted partners offer easy, economical ways to help ensure that the software installed on your PCs is properly licensed.
From time to time, both companies and individuals discover that they have been unintentionally using counterfeit software. This is a common occurrence when PCs are acquired through a trusted PC manufacturer without Windows or other operating systems pre-installed or in a full retail package.