Microsoft says its attempts to restore access to its products, including email and video call services, aren't going as expected.

Tens of thousands of users have reported issues accessing things like Outlook, Teams and and AI chatbot Copilot since Thursday afternoon.

The developer says it's working on alternative methods to get its services back online.

Microsoft has said the outage has not been caused by a cyber attack.

"As of now, we are not aware of any malicious activity that is causing this incident.

"We will continue to treat this incident with urgency and priority until full resolution.

"Once mitigated, we will provide full details of the root cause, defense-in-depth repair items, and more within a Post-Incident Report."