I have been using Windows Live Mail for 5 years.  Just installed Windows 10 2 weeks ago and no problems with email compatibility.  Today I had a message that indicated there was already of folder of Windows Live Mail.  Never seen that before so I think I clicked ok (Not sure as I am pretty computer illiterate and I don't remember it saying that I was deleting something).  Anyway, now I only have emails for the past 5 days. Per previous posts:  My email account still is listed under properties and I don't think I see a big folder in my recycle bin.  Any other suggestions?  Thank you.