Microsoft said its Outlook email service is currently experiencing an outage, preventing users from accessing their inboxes.

The issue was initially flagged as affecting the U.S. and the Americas, and later expanded to affect “any region.”

Microsoft hasn’t given a specific cause, but said that it was providing updates in its admin center, which wasn’t reachable at the time of publication. In a post on X for users who can’t access the admin center, Microsoft said some of its infrastructure was experiencing “elevated load,” and that it was “redistributing connection traffic across our broader worldwide infrastructure to help balance the load.”

The company’s last major incident was in September, when a days-long outage hit Microsoft 365, its online productivity suite that includes Outlook. During that outage, Microsoft blamed a “core authentication configuration” issue that prevented users from accessing the service.