I had to collaborate with an external client who worked heavily in Office, so I installed office on my mac, asked IT for a license, and signed in with my person

I had to collaborate with an external client who worked heavily in Office, so I installed office on my mac, asked IT for a license, and signed in with my personal account in the meantime. A couple of months later I open the Office web UI on my home PC to add a family member and find a bunch of the documents I had worked on had ended up saved there somehow. Fortunately none of it was particularly sensitive. Some stuff I work with we would have to report to a regulator if this happened.