When Microsoft terminated its ebooks store – a service – it did not have to recall the books it had vended; instead, it terminated access to them. In essence, although the books continue to exist as intellectual property, those copies of the books just went away at the sole discretion of the provider, subject only to any contractual obligations (which Microsoft has sought to ameliorate by reimbursing its customers, although to be fair, it is not clear that the company is under any legal obligation to do so).
Source: Microsoft is discontinuing their service of e-books from their online store.