Have a new Dell desktop. I have hundreds of mailbox folders, they have always been in alphabetical order on the left side of my email account page, until recently!
Now there are only 14 random folders in that space. I have no way of scrolling trough them to open a particular folder when I need it.
I can, however move an email to any of the folders by highlighting the email and press the move button. I want them lined up, all of them so that I can access them.
Look to the left of the folders you can still see for a black arrowhead. Click on those to see if your other folders are "nested" under them.
I have the same problem for week now. Several calls, no help. All my important folders are gone.
Did you try what I suggested upthread? Did you look for the black arrowheads next to existing folders?