I will occasionally log into my personal Microsoft account when accessing a Microsoft website when I am on Lunch to work on some personal projects.
At work last week, I was upgraded to Office 365 and as a result I started downloading the latest versions and trying it out in various ways. One of these was upgrading my old OneNote into the latest version (2013 -> 365)
Saturday morning, I booted up my own different PC at home and notice in the "Recommended" section on the Windows 11 start menu "Work 365". This is the name of the OneNote I created at work when I upgraded the document. I do not even have Office on my own PC. Hovering over it would show that it was located in my Works One Drive folder.
I must have been logged into my personal account on OneNote and it somehow meta-data? links it between the work and personal accounts.
I am now in process of removing all traces of my personal account from Windows on my work laptop as the very last thing I want to happen is to see personal files appearing in the Recommended section of my works laptop!