Why are my emails that I put into a folder deleted? This includes a picture folder where I have lost many photos? Does hotmail delete information out of all of my folders after one year?

It appears that information stored in my various folders is being deleted after a year.  I have important folders containing work information and a folder with pictures.  Some of my folders have been completely wiped out with everything gone.  I did not know that I would lose information in my personal folders. Help!!