It is far from zero. On Windows, it is just not considered Microsoft's problem by most people - the blame is spread across lots of different software vendors/d

It is far from zero. On Windows, it is just not considered Microsoft's problem by most people - the blame is spread across lots of different software vendors/developers. Just as an example, at our company, we run a Windows Server 2008 R2 Terminal server, with Outlook 2003 installed for email. A while ago we decided to replace the aging Internet Explorer 8 installed on that machine (shudder) with IE11 (still shudder - but it's company policy), and if people are going to use IE, I thought at least they should use a reasonably current one. Turns out, that Outlook uses IE for rendering HTML emails, and that Outlook 2003 using IE 9 or newer for that purpose results in HTML mails being truncated randomly. Since some of our users run Outlook almost exclusively in their RDP-sessions instead of their local desktops, this was a rather big deal for us, and it took me a while to figure this problem out. And keep in mind, this problem was caused by the interaction of two problems written by Microsoft itself. Imagine the non-deterministic fun you can run into with applications by a dozen or more software vendors, running across several versions of Windows, 32 and 64 bit. (Yes, I kind of needed to vent. Sorry.)