I have recently upgraded to Windows 10, a week ago.

When I opened up my emails this morning, I found three of my messages gone.  They had complete disappeared.  I had not deleted them as I needed the attachment.  I cannot find these emails in the deleted folder or in any other folders within Windows Live Mail.  I am using WLM IMAP.  No emails are showing in the 'deleted Items' folder or Recycle Bin.  I have also checked my Hotmail (Outlook) address on the internet and nothing.

How can I stop this from happening in the future?

Is it possible to retrieve the missing email?  If so, how would I do this?

Any assistance in solving this would be sincerely appreciated.