Loved the mail app before but......

Now it isn't syncing correctly. It downloads new mail but when you delete them from outlook.com they stay in the mail app. Did they update and it is now downloading a local copy of the email? If so, where is the mail profile located? And if it is downloading local copies, it would be nice if we could get local folder support as well so I don't have to leave them all in my inbox since it looks really sloppy. If this is not how this mail app works, does anyone know why deleting the mail from the server is not deleting from the mail app anymore? It's bugging me to the point that I don't want to use it anymore. I would rather just stick with outlook.com and thunderbird for if I need to save a local copy of something important. Thanks

I removed the mail app.
I use gmail & yahoo mail.
I did not like windows mail app.

You could forward all of them to gmail & create a folder there for them & delete them on windows mail ?