It’s my first day back at work after the Christmas holidays and I’m catching up on my administration. Whilst working through a pile of unread IT news I realised that late last year, in amongst all of the Windows Vista launch news and comment, I missed Windows’ 21st birthday. Whilst I don’t intend to turn this blog into a history of personal computing, I’ve previously noted significant anniversaries (35 years of the Internet, 30 years of Microsoft, 30 years of Apple, 15 years of the world wide web and 25 years of the IBM PC) and as Microsoft Windows has had such a huge impact on my computing life it seems that this is another birthday that should not pass un-announced. For those who are interested to read why this is so significant, Martin Veitch wrote an interesting article about Windows’ 21 eventful years in IT Week recently.