daria42 writes "Is Windows cheaper to patch than open source software? Of course this Microsoft-commissioned report thinks so - but a number of people disagree, including a key Novell Asia-Pac exec, Paul Kangro. Kangro highlights problems with the report including the fact that it refers to problems faced by administrators before 2003: before significant improvements were made to Linux patching tools. 'We didn't have tools like Xen for Linux then,' says Kangro. 'When I patch my Linux box I don't need to bring it up and down any number of times.' Kangro also points out the report doesn't mention costs associated with rebooting systems after a patch is applied."