A family of Microsoft word processing software products for creating web, email, and print documents.
I assume that you have by this stage had your issue resolved. I have been experiencing this over the past couple of days. However the same issue occurs on my personal laptop and my work laptop, which suggests it is not a problem with the software on my gadgets and is a general Microsoft issue.
I also checked from a different environment in case it was WIFI related, but that is not the case either.
A similar blip occurred several months ago (possibly around March 23) but resolved itself after a few (very frustrating) days.