@killyourfm I helped a friend recently with their new Windows 11 laptop because their email account (Outlook) was no longer receiving emails. It said they'd run out of space and needed to upgrade even though they have hardly any emails.
Turns out when Microsoft gets you to enable OneDrive to 'Backup' your computer, it chews into the free space they've given you for email. Their desktop had a bunch of photos and documents that had filled their cloud storage up, so now their email didn't work.