I have been saving e-mails sorted into folders, but the e-mails I am most concerned about are those dating back to 2010 when my mom became sick and we lost her.

I also had very memorable e-mails going back 12 years saved regarding my pets.

I did not realize until this evening, when I was searching for saved e-mails regarding my pets that most of them were gone.  Then I checked my folder regarding my mom and most of those are missing as well.  Where can I find them?