No, it's not spam, so thanks for replying back.
It's a genuine request to recover all my email and I desperately need help.
The original version of Outlook that I had all the email in was Outlook 2007.
I moved on from that to Microsoft Office 2013 under Windows 8.1.
As far as I am aware there is no OST file? So, the answer to that is no. I did not copy the OST file.
My email is not held on an Exchange server.
It is only downloaded via POP3.
I was thinking of trying this PST repair program.
SysInfoTools PST File Repair v2.0