对微软的批评围绕着其产品和商业运作等各个方面。软件的易用性、稳定性以及软件安全问题是受到批评的共同目标。踏入21世纪，Microsoft Windows和其他进程的安全漏洞成了一些恶意软件事故中的目标。微软还被指责在产品中锁定销售商和消费者，软件没有遵循现行标准。Linux和Windows的总体拥有成本比较也是长期的争议点。

公司一直是政府和其他企业众多反垄断诉讼的中心。2004年，欧盟裁定微软在欧盟微软竞争案中罪名成立。此外，Microsoft进程的最终用户许可协议经常被批评过于严格。

Criticism of Microsoft has followed various aspects of its products and business practices. Issues with ease of use, robustness, and security of the company's software are common targets for critics. In the 2000s, a number of malware mishaps have targeted security flaws in Microsoft Windows and other programs. Microsoft is also accused of locking vendors and consumers into their products, and of not following and complying with existing standards in its software. Total cost of ownership comparisons of Linux to Windows are a continuous point of debate.