A Microsoft file hosting and synchronization service.
The next phase of the 'update' appears to have happened for me last night - OneDrive (Microsoft) has deleted the links to the shared folders that were put in place of the synchronised folders so that I now have no access to the shared files from Explorer. The Internet shortcuts are now sitting in the Recycle Bin while OneDrive tries to process the [two] changes - it has been sat for hours today [not] doing that ...