6.x -> 7.1

[Grant Peel]

Hi all,

We have (finally) made the decision to move our server (10 -Dell) from 
Toronto to a newer data center closer to our office in London.

Before I ask this question, I would like to ensure everyone I will be 
reading all the docs I can find, but since the upgrade will be much work, I 
thought I would ask the question here anyways :-)

Question: given the items below, should I expext the make and build of 
FreeBSD and the software below, to go pretty much as it did in 6.x? (Does 
anyone know of any showstoppers)?

All software below has/will be built from ports.

Synopsis:

10 Dell 1U Rack servers (Intel Based, SCSI) more or less standard entry 
level servers)
All running
-FreeBSD 6.x,
-Apache 2.2.x
-Mysql Server 4.x
-PHP 4.x
-Perl 5.x
-Exim 4.6x
-Spamassassin etc etc

TIA,

-Grant