If you are a Windows XP user (why are you still using it….?), then you may have noticed that Lightroom 4 doesn’t run on it.

Public beta of Lightroom 4 that was recently released, doesn’t support Windows XP.

Here’s what Adobe says:

With each version of Lightroom, our goal is always to provide a consistently excellent customer experience.  Developing and testing across Operating System versions and platforms to ensure that we’re achieving this goal is a significant effort that takes time and resources.  XP is substantially different from Windows Vista and Windows 7, and requires a independent testing matrix, which increases the complexity of our development efforts.   Every cycle we need to make difficult resource tradeoff decisions and operating system support competes heavily with new features and performance enhancements planned for each version.  The decision this cycle was to end XP support for Lightroom going forward.

NOTE: On the Mac platform we needed to make a similar decision to end support for systems that are not 64-bit capable.

I guess this makes a lot of sense, doesn’t it?