Stability was the main issue. My personal experience is that the kernel would crash frequently and unpredictably. If I remember correctly, this would depend to

Stability was the main issue. My personal experience is that the kernel would crash frequently and unpredictably. If I remember correctly, this would depend to a large extent on drivers, and so vary depending on your hardware. The kernel and driver model design is based on the legacy Windows 9x family, rather than Windows NT (like its successors). Apparently, according to Wikipedia: "Although Windows 9x features memory protection, it does not protect the first megabyte of memory from userland applications. This area of memory contains code critical to the functioning of the operating system, and by writing into this area of memory an application can crash or freeze the operating system. This was a source of instability as faulty applications could accidentally write into this region and with that halt the operating system" As it was aimed exclusively at home users, various features aimed at enterprise (but often desirable to power users) were stripped out or broken.