From owner-freebsd-questions@FreeBSD.ORG  Tue Sep 12 13:14:34 2006
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Subject: Re: Newbie Experience
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On Tuesday 12 September 2006 11:16, Jeff Rollin wrote:

> I'm unconvinced you could take FreeBSD 4 box and run the kernel from 6.1 on
> it without changing anything else.

No, but the fact that you upgrade world+kernel in one go helps. FreeBSD also 
mantains a good level of back-compatibility. The 6x kernels have back 
compatibility options, and when you upgrade, the libraries from previous 
major releases are still usable by your packages.    There are also 
compatibility ports if you want to install binaries built against previous 
versions.