A Microsoft file hosting and synchronization service.
Hi, These are because the spammers have added them to your email address, these aren't taking up any space on your PC. You need to delete these under the 'Shared' tab. You will also need to change your password. Microsoft will only provide support to paid customers so we can provide community support. If this has helped you solve your problem please accept my answer so it can help others in the community with the same issue!