Microsoft confirmed a widespread outage Thursday affecting Microsoft 365 services including Teams, Exchange Online, SharePoint, Copilot 365 and Defender XDR, primarily across North and South America. The company said servers had gone offline, causing elevated network load, and that it was rerouting traffic and restarting affected servers while pausing all deployments. By mid-afternoon Microsoft had not confirmed a root cause or resolution timeline.
wired.com
· 2026-11-12
Microsoft confirmed an outage affecting multiple Microsoft 365 services this afternoon, including Exchange Online, Teams, SharePoint Online, Copilot 365 and Defender XDR. The company's support account acknowledged the issue, and both business/enterprise customers and individual users reported being affected, with some unable to even load the service status page.
engadget.com
· 2026-11-12
Microsoft Outlook suffered a major outage, with over 103,000 user reports on Downdetector, starting around 12:20 PM ET. Microsoft confirmed via its status account that it is investigating problems with Exchange Online mailbox access across multiple connection methods in the Americas, tracked under incident EX1550543.
androidauthority.com
· 2026-11-12
Several Canadian regions, including parts of British Columbia, Alberta and Manitoba, stopped observing daylight saving changes on November 1, locking into fixed UTC offsets. Microsoft has confirmed that Outlook, Power Automate, Fabric and SharePoint On-Prem have not fully adapted, producing incorrect meeting times and requiring manual fixes from users and administrators.
theregister.com
· 2026-11-03
Microsoft has published steps for IT admins to restore access to the Exchange Web Services (EWS) API after apps relying on it began failing with login prompts or protocol errors. Admins can either uncheck a block option in the Microsoft 365 admin center's Baseline Security Mode or run a PowerShell command to re-enable EWS within four hours. Microsoft says this workaround only lasts until April 2027, when EWS will be permanently retired.
bleepingcomputer.com
· 2026-10-22
Microsoft will add .msix and .msixbundle files to Outlook's default blocked attachment list starting early November, rolling out to Exchange Online users with general availability expected by mid-November. Once applied, Outlook on the web and the new Outlook for Windows will block users from sending, receiving, opening or downloading these file types by default. Admins can whitelist the formats via the AllowedFileTypes property if their organization needs them.
bleepingcomputer.com
· 2026-10-07
Microsoft confirmed an ongoing Exchange Online incident, tracked as EX1467029, causing intermittent 'Server busy' errors for users sending or receiving messages from external domains. The company says anti-spam protections may be worsening delays for some accounts, and it has not yet identified the root cause or affected regions.
bleepingcomputer.com
· 2026-09-04
OpenAI reported elevated errors and latency on ChatGPT Work, its enterprise AI agent, for about three hours on Monday, while Microsoft separately confirmed degraded functionality across Exchange Online. Downdetector logged over 1,100 reports for OpenAI products and nearly 4,600 for Microsoft Outlook around 2:24 p.m. ET, though the companies gave no indication the two incidents were related.
cnbc.com
· 2026-08-31
Microsoft confirmed a widespread outage of Exchange Online on Monday, causing Outlook users to experience delayed or failed emails, authentication errors, and search failures. The company traced the problem to an authentication component and began testing a fix on part of its infrastructure before a broader rollout. Downdetector logged over 5,000 user reports by 2 PM ET, with complaints also flooding social media.
techcrunch.com
· 2026-08-31
Microsoft confirmed it is investigating a major Exchange Online disruption, tracked internally as EX1464935, after a flood of user reports began around 5:30 PM UTC. Tens of thousands of users reported problems sending and receiving emails, logging into accounts, and managing mailboxes through Outlook and admin tools, according to Downdetector data.
bleepingcomputer.com
· 2026-08-31
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