After not using my computer for about 3 weeks I opened Windows Live Mail 2011 on my computer and found that all folders, subfolders and emails in 1 of 3 accounts have disappeared without a trace (nothing in Deleted folder).  The other 2 accounts are unchanged.  I have been accessing the needed account through my cellphone so I don't think it's anything to do with inactivity.  There have been no updates made to the system so I don't think they could have been overridden by another program.  I tried restoring the computer to dates before last usage but nothing changes.

I need these emails back because some are about 3 years old containing the only copies of photos from my daughter's birth.