Outlook Question on Spam/Junk Email Management [Office 365 (subscription)]

If I delete the folder contents for spam and junk, will I lose the incoming filtering database that shuttles spam/junk to these folders?

I have accumulated a few thousand unread messages in the Spam/Junk folders, probably a few more hundreds that are tagged as read.

I think deleting the emails would probably speed up sign-in and overall performance in the app, but I don't want to have to reteach what is spam/junk.