We continue to get reports from users who have had their Hotmail accounts taken over by a particular Chinese 'fake-storefront' scammer. The compromised accounts are then used to send out email advertising the fake shopping sites set up by this scammer.
Initial reports of this problem came from Windows users. Since then, however, we've had reports from users of both MacOS and Linux that their Hotmail accounts have been compromised. This makes it very much less likely that the passwords are being stolen by some piece of malware, and more likely that some other mechanism is being used.