KEY TAKEAWAYS
- Microsoft confirmed a “service degradation” affecting consumer Outlook and Hotmail accounts via its official Service Health page on 27 April 2026.
- Users reported being trapped in login loops, with two-factor authentication codes accepted but access still denied.
- Third-party email clients, including Apple Mail, were among the worst-affected access points, though the outage extended to the official Outlook app and web interface.
- Microsoft confirmed it is actively investigating the root cause; no estimated resolution time has been published.
Microsoft’s Outlook, a rebranded version of Hotmail, suffered a significant service disruption on the morning of Monday, 27 April 2026. Users across multiple regions, specifically the UK and the US, are reporting they were unable to access their email accounts at the very start of the working week.
Microsoft has officially acknowledged the incident through a notice on its Service Health page, stating the company is “actively investigating a potential problem with users accessing Outlook.com.”
Complaints flooded social media and Reddit within minutes of the disruption beginning. Many users initially feared their accounts had been compromised before it became clear the failure was on Microsoft’s end, not the users’.
What the Outage Actually Looks Like for Users
The failure is not a simple crash.
As Mashable confirmed, the primary symptom is an endless login loop. Users enter their password correctly, complete a two-factor authentication step, and are then redirected straight back to the login screen as though the credentials were never accepted.
Others report being signed in momentarily before being ejected from the application within seconds, with their inboxes never actually loading.
Some users also described being locked out entirely, with error messages citing too many incorrect sign-in attempts, despite never having entered a wrong password.
As Tom’s Guide’s live outage tracking confirmed, the issue appears most acute when accessing Outlook through third-party email clients such as Apple Mail. In those cases, the authentication handshakes between Microsoft’s servers and the external app appear to be failing silently.
However, users attempting to log in through Outlook’s own official app and via the Outlook.com web browser interface have also reported full lockouts, suggesting the problem is not limited to third-party integrations.
Microsoft’s Response and What Is Known So Far
Microsoft posted a notice on its Microsoft 365 Service Health dashboard saying it is investigating a possible issue affecting consumer Outlook.com access.
The company has not yet confirmed the cause of the authentication failure, and no estimated time for restoration has been provided.
Tom’s Guide reported that the outage appears to have begun in the early hours of Monday morning, with complaint volumes on Downdetector rising sharply by mid-morning UK time.
Microsoft said it would provide rolling updates as the investigation progresses.
This kind of authentication-layer failure, where the login process itself breaks rather than the email service going offline, is particularly disruptive. As it prevents users from even establishing whether their data is intact, it is creating unnecessary anxiety around account security.
The incident highlights how dependent day-to-day productivity has become on a single authentication layer managed by one provider.
This has been flagged in the UK government’s Sovereign AI and Digital Infrastructure Strategy as a systemic resilience risk for organisations relying on US-based cloud services.
What You Can Try While Microsoft Investigates
If you are locked out, there are a handful of workarounds worth attempting.
- Access Outlook directly via a web browser at Outlook.com instead of using a desktop or mobile app
- Sign out fully, clear your browser’s cached credentials, and sign back in
- Remove and re-add your Outlook account in Apple Mail or another third-party email client
- Try again later if issues persist, as server-side authentication may still be stabilising
The episode sits alongside a growing list of Microsoft service and infrastructure disputes making headlines in the UK in 2026, from the Competition Appeal Tribunal’s £2 billion cloud licensing case to today’s outage.
For anyone whose work depends on Outlook, it is worth bookmarking Microsoft’s Service Health dashboard as a first port of call rather than assuming an account breach.
For anyone dependent on Outlook, it is worth checking Microsoft’s Service Health dashboard first rather than assuming a breach.
Keeping an alternative contact method for urgent communication is also advisable, as the UK’s reliance on US tech platforms continues to be a regulatory and diplomatic concern.
