> Microsoft has Windows Defender, its in-house alternative to CrowdStrike, but because of the 2009 agreement made to avoid a European competition investigation, had allowed multiple security providers to install software at the kernel level.<p>> The document states that Microsoft is obligated to make available its APIs in its Windows Client and Server operating systems that are used by its security products to third-party security software makers. The document says that Microsoft has to also document the APIs on the Microsoft Developer Network except where they create security risks.