Microsoft will be issuing service credits to Office 365 customers who were hit by email service outages last week and again earlier this week. The company also says the problems that caused the outages have been resolved and a review is underway to prevent a re-occurrence.

"All of us in the Office 365 team and at Microsoft appreciate the serious responsibility we have as a service provider to you, and we know that any issue with the service is a disruption to your business -- that's not acceptable," wrote Rajesh Jha, corporate VP of the Microsoft Office division, in a blog post about the outages.