
"x32 ABI" promises to take advantage of the benefits of 64-bit x86 processors without suffering from the overhead in 64-bit operation. At present, maintenance at Kernel.org has slowed down kernel development. Some kernel hackers are demonstrating their sense of humour with a Linux logo reminiscent of Windows 3.1 and a rickrolling kernel module.


Mozilla has begun collecting feedback on what appears to be a more serious approach to move Firefox for Windows from 32 to 64 bit.
The Ubuntu 64-bit edition comes with the capability to run the 64-bit Java Development Kit (JDK) without any extra configuration. If your system doesn't have a lot of memory and you do a lot of developing, this may not be the optimal version for you. Given that 64-bit operating systems and hardware are capable of running 32-bit software, you can run a 32-bit Java JDK from your 64-bit Ubuntu installation, although some extra steps are involved.
Mac Pro workstation computers boot the Mac OS X operating system into 64-bit mode every time the computer is powered on or restarted. Mac Pro workstations booted into 32-bit mode by default until the introduction of the mid-2010 model, though every Mac Pro since the early 2008 model is capable of booting in 64-bit mode. You can change the boot mode of a Mac Pro workstation from 64-bit to 32-bit mode through a key combination or by editing a system file.
Office 2010 is the first version of Microsoft Office productivity software applications that come in both 32-bit (x86) and 64-bit (x64) versions. However, many add-ons, plug-ins, or third-party application programs does not yet support nor compatible with 64-bit version of Office programs, especially Outlook 2010 where synchronization and interaction with external programs is essential.