So, I have decompressed my brand new download of Exchange 2013 SP1. This was downloaded from the link at the bottom of the post.
So to start my upgrade I have tried to start by running the schema preparation which then advises me that I am welcomed to:
'Microsoft Exchange Server 2013 Cumulative Update 3 Unattended Setup'
Is this poor QA or was the incorrect file uploaded?
http://www.microsoft.com/en-us/download/details.aspx?id=41994