Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
I think this is the upto date answer to your question: Yes, you need to pay for ad free Outlook.com webmail.
And to all the people whinging about not getting ad free webmail when they pay for Office 365: maybe the deal is that the whole world gets Outlook.com webmail for free.... and then if you subscribe to Office 365 you get ad free outlook in an app for your desktop/laptop + tablet + phone...... so please stop whingeing about seeing adverts when you go and use the 'free to the world webmail'!
UPDATE: there is actually a free webmail and cloud productivity service that has minimal / no adverts. Try Apple's iCloud for size.