After browsing to the folder that contains the OE files, I get a message:

'No messages can be found in this folder or another application is running that has the required files open.

Please select another folder or try closing applications that may have files open.'

I did make the process work once, but realised I had missed some folders when making my back up copy.  So decided to start from scratch.  I have uninstalled and reinstalled Windows Live Mail but still get the same message.  I have tried importing from my pocket hard drive and tried copying the files to a location on my new  Windows 8.1 computer.

Always get the same message.

(I have successfully imported my contacts.)

What should I do?