Interventionist Extraordinaire

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Also this, from a Toms Hardware article on the situation:

About an hour later, the astronauts received the welcome news that Outlook was back online. However, it would appear offline… Nice piece of software. “For Outlook, we were able to get it open. It will show 'offline,' which is expected,” said the Capsule Communicator at Mission Control, at around 14 hours 20 minutes into the stream.

That same article also notes that none of the actual flight systems use windows, it's all custom software running on specialized radiation-hardened hardware handling the important systems. The windows instance is part of a separate system used to present a "friendly" interface to the astronauts for handling things like schedule management and low-importance communication with friends and family via email and chat - like that which is done through Microsoft Outlook.

Basically, it's not that the flight computer is glitching, or that the life support systems depend on the microsoft office suite, it's more like the astronauts personal smartphone used during down time is on the fritz, even though it is technically integrated into the craft.