Home machines are all 32-bit hardware (AMD AthlonMP, Intel P4, Intel Celeron, Intel P4-m, Intel P3), thus all are running 32-bit OSes (WinXP, FreeBSD, soon OpenSuSE).
Work desktops are both 32-bit hardware (AMP Sempron, Intel P4) running 32-bit OSes (Debian Linux, WinXP).
Work servers are mostly 64-bit hardware (AMD Opteron) running 64-bit OSes (Debian Linux, FreeBSD). Some run 32-bit. Mostly depends on what the server is doing, and whether it has more than 4 GB of RAM.
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