Microsoft Outlook and 365 Hit by Widespread Outages, Users Report Login and Email Failures

Tech giant Microsoft is currently navigating a wave of service disruptions affecting both Microsoft Outlook and the Microsoft 365 suite.

According to real-time outage monitor Downdetector, the issues began spiking early Monday, March 16. The data suggest a multifaceted problem: 32% of Outlook users are struggling specifically with logging in, while 21% report they simply aren’t receiving messages.

The frustration is palpable among the user base. One user, Damien O’Farrell, noted that while the service showed signs of life over the weekend, stability remains elusive.

“Service came back on and off on Saturday afternoon, which leads me to believe this will get solve[d] eventually,” O’Farrell stated. He added that he has already “reported the issue through the admin portal in Office 365” in hopes of a resolution.

The outage doesn’t seem to be hitting everyone equally. Some users are reporting that while their corporate accounts are functioning, their personal or family setups are hitting a brick wall.

A user identified as mec2dfw highlighted this specific discrepancy: “I have two accounts, one a Microsoft Family account, one an Office 365 account, O365 works fine, the Microsoft Family account with a personal email domain just shows disconnected. Can connect via the web browser, but Outlook is disconnected.”

Local network conditions may also be playing a role. Johan Vorster observed a potential regional or ISP-based bottleneck, noting, “I notice MS is down or very slow on Vodacom connection but is fine on Telkom and MTN.”

Technical glitches: Gmail, Yahoo, and group errors

Beyond the general connectivity issues, Microsoft Support has confirmed two specific technical “bugs” currently plaguing the classic Outlook desktop client.

1. The Gmail/Yahoo sync failure

Users attempting to sync Gmail or Yahoo accounts may encounter errors 0x800CCC0E or 0x800CCC0F. Microsoft reports that these accounts stopped syncing as far back as February 26, often following a password change.

The official status from Microsoft is INVESTIGATING, with the team stating: “The Outlook Team is investigating this issue. We will update this topic with fix status as soon as we get it.”

The workaround: Microsoft suggests closing Outlook and using the Windows Credential Manager to remove specific “OAUTH2” credentials associated with Google or Yahoo, which should force a fresh login prompt.

2. The ‘can’t connect to server’ group error

For those trying to organize their teams, creating new groups in classic Outlook is currently triggering a red error message: “Can’t connect to the server.” Microsoft explains this is due to a failure in the “AD Graph call” during the validation process.

Regarding a fix, the support team noted that “The Outlook Team is working to release updated group functionality that uses REST APIs which will address this issue.”

Until that update rolls out, users are being told to create and edit their groups using Outlook Web Access (OWA) or the “New” Outlook interface.

What now?

If your desktop app shows “Disconnected,” your best bet for now is to switch to your web browser. Most reports indicate that while desktop clients struggle with credentialing and syncing, the web-based versions of Outlook and Microsoft 365 remain the most reliable way to keep your Monday on track.

Also read: Microsoft is bringing an Xbox-style interface to Windows 11 PCs starting in April.