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.

Microsoft confirmed that the majority of services have recovered for most customers.’we continue to see a small subset of customers whose tenants are located in North America region who are still impacted,’ read a notice on Microsoft’s office status page.

The majority of services are now recovered for most users. We’re closely monitoring some residual impact for a subset customers located within North America.

Microsoft tweeted that services were mostly back at 10:30pm et. The company said it had rolled back a change thought to be the cause of the issue at 6:36pm et.

Microsoft said in an 8:57pm et Tweet that it has’applied mitigation steps’ to try and fix the problem.