Vista's Service Pack 2 rumoured to be released to manufacturing in April 2009:
From the other side of the world comes a report that Windows Vista Service Pack 2 will be released
to manufacturing in April 2009, roughly a year after SP1. The Malaysian website TechARP has a
pretty good track record with this sort of prediction, and my sources tell me that schedule sounds
about right.
Meanwhile, here in the U.S.A., some people are inferring more Vista doom and gloom from this
schedule. My buddy Dwight Silverman at the Houston Chronicle says “SP2 is being rushed out
the door” to keep up Vista’s momentum. Eweek’s Channel Insider calls SP2 a
“last-ditch attempt to drum up sales for [the] beleaguered [Vista] operating system.”
The Register says “Microsoft seems to be in a hurry with this release.”
They all need to dust off their Windows history books to see that the reality is exactly the
opposite. If Vista SP2 does make its official appearance in April, it will mark a return to normal
development and release cycles for Microsoft, which lost its way badly with Windows XP.
I’ve got the proof, in easy-to-read chart format. Here’s a timeline of every Windows
service pack Microsoft has delivered since the release of Windows NT 4.0 in July 1996. Each
color-coded bar represents the number of days between each service pack and its predecessor (RTM,
in the case of SP1 releases). See any patterns?

As measured by service pack releases, the XP era was a distinct anomaly for Microsoft. Over the
past 12 years, Microsoft has delivered 14 Windows service packs. The gap between SP1 and SP2 was a
record 697 days, nearly two full years. But that pales in comparison to the gap between SP2 and
SP3, which was nearly four years. If we throw out SP3 and also disregard NT4 SP2, which appeared a
mere 59 days after its predecessor, we discover that the average gap between service-pack releases
is around 300 days, or just under a year apart. If Vista SP2 arrives in mid-April 2009, it will be
355 days since its predecessor, or very close to the historical averages.
In fact, the chart gets even more interesting if you include major updates delivered in formats
other than service packs. The expanded chart below paints an interesting picture:

Sometimes these not-quite-a-service-pack updates take the form of “update rollups.” The
most noteworthy recent example was Update Rollup 1 for Windows XP, which was released on October
15, 2003, about midway between XP SP1 and SP2. It wasn’t a service pack, but it did offer an
easy way to install a year’s worth of security patches on Windows XP without having to
download them via Windows Update. (And no, there was no Update Rollup 2 for Windows XP, although
Microsoft has used that term for several cumulative updates to the Media Center and Internet
Explorer components of XP and Vista.)
Beginning with Windows Vista, Microsoft is using Windows Update to deliver reliability,
compatibility, and performance fixes in addition to security patches. For Windows users, this is a
new development. Windows XP users never got this type of update, but Vista users were treated to a
steady stream of them.
Source -
Ed
Bott's ZDNet Blog