Hi,

   I've had a very similar problem to others here. After the upgrade, every folder I've ever created in the  c.15 years i've had this hotmail account was completely emptied of their all emails. This included a folder i created in July with vital work information in it.  My inbox itself doesn't appear to be affected, and still has emails in it dating back years (though i can't be sure how many were in there in the first place). 

Just to clarify, this is not a result of my deleting, or conversation threading, etc. I could really do with some direct help on this asap, please. The lost emails is a source of huge distress, and i've stored all the correspondence that has been the most important to me there

Thanks!