apache13 to 22

[Perttu Laine]

I'd like to upgrade Apache13 to Apache22, but I'm wondering what else I need
to change or reinstall? PHP, MySQL, SquirrelMail are those I'm wondering
about. Do I need reinstall them, some of them or change confics much. Or is
it just removing apache13 and installing apache22? And also can I copy paste
vhost rules etc. from old config or are they very different? Box I need to
do this in has about 150 www-users in it so I don't like to break it for a
long time.

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kpn @ IRCnet