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Microsoft said most Outlook and Teams services were restored Monday evening after a day of technical delays.

The company added that full restoration of services will occur on Tuesday. At the height of the outage, tracking site Downdetector showed more than 5,000 problems reported by users, although this data does not fully reflect the scale.

“We have restored functionality to all affected services, with the exception of Outlook on the web, which is still affected for a small number of users,” Microsoft wrote in a post on X shortly before 11 p.m. ET. “We are monitoring and resolving Error to ensure full recovery.”

As of Monday afternoon, the company said it had seen some recovery after providing a solution to the problem, and reports of outages at Downdetector had dropped sharply. At around 7:30 p.m. ET, the tech giant estimated the issue would be resolved in three hours.

By midday, the company said the fix had reached “approximately 98% of affected environments,” even as reports of Downdetector continued to mount. It may take some time for updates to reach customers’ systems.

However, Microsoft subsequently noted that these restarts “progressed more slowly than expected for the majority of affected users” and did not yet provide an estimated time for a fix. At 2 p.m. ET, the company said the recovery was still facing delays.

The outage has hampered many office workers – although some US users on X were celebrating the small break before Thanksgiving weekend.

Tech outages have had a devastating impact around the world this year, although Microsoft’s case is not as widespread in comparison. CrowdStrike’s software flaw led to the largest IT outage in history over the summer, disrupting airline traffic, crippling hospitals and costing Fortune 500 companies more than $5 billion in direct losses.

This story has been updated with additional information