Illustration by Alex Castro / The Verge

Some Microsoft services, including Outlook, Office 365, and Microsoft Teams, experienced a multi-hour outage on Monday, but they should be back for most users, according to the company.

“We have confirmed via our monitoring that the majority of services have recovered for most customers,” reads a notice on Microsoft’s Office status page. “However, we continue to see a small subset of customers whose tenants are located in North America region who are still impacted. We’re now investigating mitigation steps for those customers who are still affected.”

The company first acknowledged issues at 5:44PM ET via the Microsoft 365 Status Twitter account, and said it had rolled back a change thought to be the cause of the issue at 6:36PM ET. But just 13 minutes later, the company tweeted again to say that it was “not observing an increase in successful connections after rolling back a recent change.” Microsoft tweeted that services were mostly back at 10:30PM ET.

Microsoft’s Azure Active Directory service is still experiencing issues, according to the Azure status page. However, Microsoft said in an 8:57PM ET tweet from the Azure Support account that it has “applied mitigation steps” to try and fix the problem and that “most customers should see signs of recovery at this time.”

Update, September 28th, 10:50PM ET: Updated headline and article with information about services returning.