Microsoft 365 suffered a multi-day outage this week that disrupted email, Teams, SharePoint and several other services for organisations worldwide, including Australian businesses.

• What happened: A fault in the authentication system behind Exchange Online caused login failures and delivery delays across Outlook, Teams, OneDrive for Business, SharePoint Online, the Microsoft 365 admin centre, Copilot and Microsoft Defender.
• Who was affected: Any organisation relying on Microsoft 365 for email, chat or file access experienced intermittent outages, with some users locked out entirely.
• Current status: Microsoft reports services have been steadily recovering, though residual issues may still surface over the coming days.
• What to do: Businesses that noticed delayed or missing emails during this period should check with staff for anything that may need re-sending, and watch the Microsoft 365 admin centre for lingering alerts.

We recommend businesses treat outages like this as a reminder to keep a secondary way of reaching staff and clients, such as mobile numbers, for when core systems go down.