Summary:
We are planning to drop support for Windows XP on October 26, 2012; your existing Logos 4 installs will continue to run, but future releases of Logos Bible Software will require Windows Vista SP2 or newer.
This will not disable any XP systems, but future releases of books may use new features or data types only available in newer versions of Logos, and thus will not be usable on Windows XP systems.
Rationale:
Logos 4 depends on a number of Microsoft platform components, including the .NET framework. With the October 26, 2012 release of Windows 8, Microsoft is upgrading the .NET 4 platform to .NET 4.5, which is an "in-place" install replacing .NET 4 (which we're planning to move to for many reasons, including performance and bug fixes).
.NET 4.5 will run on Windows Vista SP2 and later version of Windows, but specifically NOT Windows XP.
October 26, 2012 is the release date for Windows 8; at that point it will be 11 years since Windows XP was released (Oct 25, 2001), and it will be three full generations (Vista, 7, 8) out of date.
Very few Logos users remain on XP, and continuing to support XP in new releases takes development and testing resources, as well as making it more difficult to use other capabilities only offered on newer versions of Windows.
Advance Notice:
We have learned that nobody likes to get "discontinuation" news at the last minute. So this is our first advance notice, and your chance to speak up if there's a really compelling reason we should not drop XP on October 26, 2012. If we don't hear a compelling argument, we'll promote this news via other channels besides the forums soon.