[CentOS] Upgrading from 4.4 to 4.7

Hello all,
For (system) certification purposes, we have to upgrade our 4.4 machines to
4.7.
In the past I usually have just reinstalled machines to save the (perceived)
headaches of upgrading. That is not an option in this case.
Are there any pitfalls to watch out for when upgrading? Is it even possible
to go up 3 revisions?
Thanks,
John

-- 
Did you know that it costs forty thousand dollars a year to house each
prisoner?...I don't think we should give free room and board to criminals. I
think they should have to run twelve hours a day on a treadmill and generate
electricity. And if they don't want to run, they can rest in the chair
that's hooked up to the generator.
-George Carlin
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.centos.org/pipermail/centos/attachments/20100624/cb61a09b/attachment.html>