Microsoft 365 users experienced connectivity errors on Thursday. 

The disruption primarily affected Exchange Online, which is Microsoft's cloud-based email service used by businesses and organizations, Fox 13 reported. 

The problem prevented users from accessing their mailboxes, sending or receiving email through Outlook. 

Microsoft said that the problem was seen in users across multiple regions. Its engineers determined that a portion of its infrastructure is experiencing elevated load across multiple regions, which is likely the source of the issues.