Think is the third major Outlook update cock up from the House of Microsoft in the last 12 months. Getting tired of their laissez-faire attitude to update quality, especially with what is arguably their crown jewel in the business market.
Can't help but draw a direct correlation between them shutting down the Trustworthy Computing unit, and updates getting less reliable. (https://www.theregister.co.uk/2014/09/19/ms_shutters_twc/)
As I Commented on that article: "OK, Microsoft - close the department, but don't you dare stop doing the work and ethos they promoted, or they'll be hell to pay."