Steve - Its a question i would have to ask the boss - Ive been here for approx 5months so its always been 2005 on this particular server (all the others are 2008r2). As far as i know its always been 2005 version.

My main concern is that sql monitor picked up the alert a few days ago so it must have been switched off recently (checksum). I suppose I could ask if anybody turned it off - I cant see a reason why they would do it, especially has the server isnt under any strain cpu wise.

We do a weekly index rebuild so i guess that will then let me know if anything is worng now that i have renabled the checksum.