Microsoft says that its Outlook email services have been fully restored, following problems which lasted several hours.
Many Outlook users were unable to send email or access their accounts.
Hundreds from around Europe commented on the website Downdetector that they had been affected by the problem – many since Monday morning.
One common issue seemed to be that sent emails remained in the drafts folder and were not delivered to recipients.
On its website, Microsoft said the service dropped “unexpectedly” and it was working on a fix.
Not all account holders were affected.

BBC

Microsoft has had outages before I think if this was Gmail it would have made more news.