In August 2012, we announced that Windows XP support would be ending October 26, 2012.
As it turned out, we ended up putting Logos 4 for Windows XP in "maintenance" mode: after October 26, we shipped seventeen updates and Service Releases to Windows XP users. These updates let Logos 4.x read the latest resources, support the latest data types, sync your documents and settings to Logos 5 and documents.logos.com, and fixed critical bugs.
We're now announcing that we're officially ending support for Windows XP and OS X 10.5 on April 8, 2014 (the same day that Microsoft ends extended support for XP). There will be no further updates to Logos 4.6c on Windows XP/OS X 10.5 after that date.¹ Your copy of Logos will not be disabled. Your existing install will continue to run with the resources you already have. However, new resources purchased from logos.com may not be readable by Logos 4.6c. Your documents and settings may eventually stop syncing to newer versions of Logos. Web services that are only used by Logos 4.6c may be discontinued without notice. Eventually, you may have to permanently "Work Offline" to keep using the software.
I'm not saying that everything will break instantly on April 8; rather, since Logos 4.6c won't be getting any more updates, it will gradually become incompatible with resources and web services that are getting updated. I don't have a specific date for when this might first happen. [Update: The first resources that require Logos 5.2a or later shipped on May 16, 2014. As of June 1st, there are fewer than 200 resources that require 5.2a; the majority of resources still work on Logos 4.6c.]
Note: If you're using Logos 4.6c on Vista/OS X 10.6 or later, you can update to the free version of Logos 5 to get the latest bug fixes and features right now: https://www.logos.com/installation
On that same date, Logos 5.2a (currently in beta) will become the new "maintenance" version for Windows Vista, OS X 10.6, 10.7 and 10.8; Logos 5.3 will require Windows 7 SP1 or OS X 10.9 or later. If you're running Logos 5.2a on Vista/10.6/10.7/10.8, your system will not be disabled; Logos 5.2a will continue to receive updates to let you read the latest resources purchased from logos.com, to keep sync working, to fix critical bugs, etc. You will continue to receive support for your version of Logos 5.2a on your OS. However, major new features in Logos 5.3 and later will require a newer operating system version.
For a detailed discussion of "Supported", "Maintenance", and "Unsupported" versions, please see this new support article: https://www.logos.com/support/lifecycle
This change lets us focus our limited development, testing, and support resources on the latest versions of Windows and Mac OS X, which are used by the vast majority of our customers. (We have done an analysis of our user base, and Vista/10.6/10.7/10.8 users are a small portion, and XP/10.5 is an extremely small fraction.) It lets us take advantage of new OS features developed by Microsoft and Apple, and dramatically cuts down on the possible configurations for testing.
Logos 4.6c and 5.2a won't automatically download resources or updates that your computer doesn't support, so it's safe to keep downloading updates if you're running one of those versions.
Finally, if you're running OS X 10.6, 10.7 or 10.8, you should consider updating to the latest version of OS X 10.9 Mavericks free on the App Store: http://www.apple.com/osx/how-to-upgrade/; this will allow you to run the latest version of Logos 5.
¹ We reserve the right to ship additional 4.6c SRs at our discretion without invalidating this policy.