I suppose I should add that server Adelie02 is slated to go the way of the dodo when we shift locations in a month or so time. But when I contemplate the pallet loads of paper that have passed through the printing system as well as the collection of optical disks and filled external USB hard drives containing backups, I can only be a little misty for this grand performer. All it ever asked for was a RAM upgrade and a new hard drive and some patience (the last upgrade took ~22hours to complete). It did caught out a little by the last upgrade, I suspect due to Samba wanting to use more memory when getting directory listings.
I am experiencing some missing files during scheduled backups that never happened before (only from XP machines) and the need to refresh views when accessing directories remotely.
Back on topic, my view is that you should run the latest software until the hardware limitations force you to do otherwise.