The slowdown in the sales of Unix servers - a 10.5 percent decline according to IDC - is another sharp reminder of the changing world of IT.  When I wrote my blog on 25 years of IT journalism, I omitted to mention the state of Unix

Throughout the 80s and the 90s, Unix was a dominant system - and the strengths of Berkeley Unix and AT&T's version were debated as fervently as mediaeval metaphysicians argued about angels. Writing about Unix at that time, it was essential to know something about the operating system, we learned various commands and, naturally, told Unix jokes.

So, to see the decline in the system is sad a way but a reminder of the way that thing change in this industry. Unix's wayward child Linux is gradually taking the place of the older operating system in many organisational servers

"IDC expects the recovery to extend to Unix and mainframe platforms in the second half of 2010 as the technology refresh extends from volume- to value-oriented systems with somewhat longer planning horizons," Matt Eastwood, group vice president of enterprise platforms at IDC, in a statement accompanying the numbers