That answer is not vague at all. They are not guaranteeing you your own car. If it's too late to change, tell them you want your own car and you don't mind paying extra for it. There's no way I'd risk being in a car with someone else given what we heard recently.
As someone under whose purview was a 3,000 user email system, I can assure you Microsoft pull this shit all the time and your IT staff have to find the offending emails and release them, and *try* and get Microsoft to whitelist the domains/addresses if possible, which is usually like pulling fucking teeth.
As I understand it, people are now starting to get emails on their Hotmail accounts, so it might be resolved.
By the way, they are not emails *from* Microsoft, they are emails *to* Microsoft, and it is (or was) Microsoft who was blocking them.