Just checked my email

[quote]
The Retail vs. OEM sku's are different...they were released by MS on different days, hence the different date and timestamps. They utilize different PID numbers...

All should be version 2600.

OEM CDs cannot upgrade while Retail CDs can typically perform an upgrade or a full install.<hr></blockquote>

Still not a satisfactory explanation but it puts a little light on things.......