--- title: "Microsoft 365 Outage: Is Your Business Email Ready for the Next One?" description: Microsoft 365 went down on November 12, cutting off Exchange Online email. Learn how MDaemon Email Server helps you take back control of your business email. image: https://blog.mdaemon.com/hubfs/M365-down-featured-image-captioned.png --- [![MDaemon Technologies](https://blog.mdaemon.com/hs-fs/hubfs/MDaemon-Technologies_logo_large.png?width=564&height=110&name=MDaemon-Technologies_logo_large.png "MDaemon Technologies")](https://mdaemon.com/) - [Blog Home](https://blog.mdaemon.com) # MDaemon Technologies Blog ## [Microsoft 365 Outage: Is Your Business Email Ready for the Next One?](https://blog.mdaemon.com/microsoft-365-outage-is-your-business-email-ready-for-the-next-one) By [Brad Wyro](https://blog.mdaemon.com/author/brad-wyro) - [Tweet](https://twitter.com/share) If your users spent Thursday afternoon staring at Outlook connection errors, they were not alone. A widespread Microsoft 365 outage that began yesterday (November 12, 2026) cut off access to Exchange Online mailboxes and the Microsoft services that depend on them, and recovery was still underway on Friday morning. ## What happened Microsoft opened incident EX1550543 at 16:17 UTC on November 12 after many users lost access to their Exchange Online mailboxes through Outlook on the web, the Outlook desktop and mobile apps, and other connection methods. The problem soon reached other regions and the Microsoft 365 services that depend on Exchange Online, including Teams, SharePoint Online, and Microsoft 365 Copilot. Microsoft said there was no sign of malicious activity, and by Friday morning email access and delivery were gradually improving ([BleepingComputer](https://www.bleepingcomputer.com/news/microsoft/massive-microsoft-365-outage-disrupts-outlook-teams-copilot-worldwide/)). Microsoft has not yet published a root cause. ## Why one outage reached so far In Microsoft 365, Exchange Online is more than a mailbox. Teams calendars and meeting scheduling, Copilot's access to workplace data, and SharePoint integrations all depend on it, which is why an email outage also disrupted meetings, files, and AI tools. Organizations running a hybrid Exchange environment were not fully insulated either. Microsoft warned that on-premises mail flow could be affected for messages traveling to or from Exchange Online. The Microsoft 365 admin center was also affected, so many administrators could not open the incident details that Microsoft was directing them to ([Windows Report](https://windowsreport.com/microsoft-confirms-exchange-online-and-admin-center-is-down-in-latest-outage-investigates-mailbox-access-issues/)). ## Still waiting on Microsoft? If your users still cannot reach their mailboxes today, there is little your IT team can do besides watch Microsoft's status updates. That lack of control is the biggest drawback of trusting your business email to a single cloud provider. Running your own email server with MDaemon changes that: - **You can see what is happening.** MDaemon's logs and mail queues are on your own server, so your team can diagnose a delivery problem directly instead of refreshing a status page. - **You decide when changes happen.** Updates, maintenance, and configuration changes run on your schedule, not your provider's. - **Your mail does not depend on someone else's data center.** A failure in another company's infrastructure cannot lock your users out of their mailboxes. ## Is your business prepared for the next outage? Cloud email is convenient and easy to scale, but it also puts the uptime of your most important communication tool in someone else's hands. When the provider has a bad day, your only option is to wait. An email continuity plan should be written and tested before the next outage, not during it. Start with these questions: - Where does inbound mail go if your primary mail system is unreachable? - Can your users still send and receive email if one platform goes down? - Who on your team can change DNS records and mail routing, and how quickly? - How will you reach staff if the platform you normally use to contact them is the one that is down? ## How MDaemon Email Server fits into an email continuity plan [MDaemon Email Server](https://mdaemon.com) is an email server that you run on your own hardware, in your own data center, or in a private cloud. Because it does not depend on Microsoft's infrastructure, it gives you several ways to reduce your exposure to a single provider's outage. ### Move your email to MDaemon Migrating from Microsoft 365 to MDaemon puts your mail server, your data, and your maintenance schedule under your control. MDaemon includes email, calendars, contacts, browser-based webmail, ActiveSync support for mobile devices, and MDaemon Connector for Outlook users. Our [MDaemon vs. Microsoft 365 comparison guide](https://blog.mdaemon.com/hubfs/Comparison%20Docs/US_MDaemon-Mail-Server-vs-Microsoft-365_Comparison-Guide.pdf) compares features and per-user pricing side by side. ### Run a hybrid environment If you are not ready to leave Microsoft 365 entirely, you can host some users, departments, or locations on MDaemon while the rest stay on Microsoft 365. With users split across two platforms, a Microsoft outage no longer takes everyone offline at once. A hybrid setup requires planning for mail routing between the two systems, so involve your MDaemon partner or our support team early. ### Use MDaemon as a backup mail server MDaemon's [Domain Gateways](https://help.mdaemon.com/MDaemon/en/gateway_domain_gateways.html) feature can accept and store mail for a domain that is hosted somewhere else, which allows MDaemon to act as a backup MX server for that domain. To avoid storing mail for addresses that do not exist, MDaemon can [verify recipients](https://help.mdaemon.com/MDaemon/en/gateway--verification.html) against an LDAP or Active Directory server, a Minger server, or a list of valid addresses. When your primary server is reachable again, MDaemon can [deliver the stored messages](https://help.mdaemon.com/MDaemon/en/gateway_gateway.html) to it over SMTP. Keep in mind that a backup MX only receives mail when sending servers cannot reach your primary MX host. It protects inbound mail when your primary mail system stops accepting connections, but it does not give users access to their existing Microsoft 365 mailboxes. ### Build redundancy into MDaemon itself Running your own email server means uptime is your responsibility. To help with that, MDaemon includes a [Cluster Service](https://blog.mdaemon.com/setting-up-mdaemon-for-failover-high-availability) that shares configuration between two or more MDaemon servers on your network. The Cluster Service can be found under **Setup » Cluster Service** in the MDaemon console. A cluster uses shared network storage, and a load balancer routes traffic between the nodes. For requirements and setup steps, see [Setting up MDaemon for Failover / High-Availability](https://blog.mdaemon.com/setting-up-mdaemon-for-failover-high-availability) and our [MDaemon Clustering knowledge base article](https://knowledge.mdaemon.com/mdaemon-clustering). ### Let a provider host it for you If you want a dedicated email environment without managing the hardware yourself, [MDaemon Hosted Email](https://mdaemon.com/pages/mdaemon-hosted-email) is available. Managed service providers can also host email for their customers with MDaemon Private Cloud, an edition of MDaemon built specifically for MSPs. None of these options switches on by itself during an outage. Each one requires DNS, routing, and testing work done in advance, which is exactly why the planning needs to happen now. ## Don't wait for the next outage Microsoft will restore service and eventually explain what went wrong. What your organization does before the next outage is up to you. Download a [free trial of MDaemon Email Server](https://mdaemon.com/pages/downloads-mdaemon-mail-server-free-trial) and test it alongside your current environment. To talk through a migration, hybrid, or backup mail server setup for your organization, [contact our sales team](https://mdaemon.com/pages/contact-us) or your [local MDaemon partner](https://mdaemon.com/pages/find-a-partner). Tags: [MDaemon Email Server](https://blog.mdaemon.com/topic/mdaemon-email-server), [#IsEmailDown](https://blog.mdaemon.com/topic/isemaildown), [Microsoft 365 Exchange Alternative](https://blog.mdaemon.com/topic/microsoft-365-exchange-alternative) ![Brad Wyro](https://blog.mdaemon.com/hs-fs/hubfs/Brad-2023v2.jpg?width=100&height=100&name=Brad-2023v2.jpg) #### Written by [Brad Wyro](https://blog.mdaemon.com/author/brad-wyro) Brad has worked in technical and marketing roles at MDaemon Technologies, where he contributes as Content Marketing Manager. Brad balances technical and creative information to develop easy to understand videos and content to educate prospects and customers. 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[Quarantine (1)](https://blog.mdaemon.com/tag/quarantine) - [RelayFax (1)](https://blog.mdaemon.com/tag/relayfax) - [Software (1)](https://blog.mdaemon.com/tag/software) - [Training (1)](https://blog.mdaemon.com/tag/training) - [Upgrade (1)](https://blog.mdaemon.com/tag/upgrade) - [Web Conferencing (1)](https://blog.mdaemon.com/tag/web-conferencing) - [Windows Server (1)](https://blog.mdaemon.com/tag/windows-server) - [internal email threat (1)](https://blog.mdaemon.com/tag/internal-email-threat) - [ssl (1)](https://blog.mdaemon.com/tag/ssl) - [tax scams (1)](https://blog.mdaemon.com/tag/tax-scams) See all #### About MDaemon Technologies MDaemon Technologies is a pioneer in developing email and email security software helping to protect customers from evolving cyber-security threats. Its products and services are trusted by thousands of organizations in over 140 countries. For more than two decades, the company’s products have been developed with the ongoing input of IT professionals who demand reliable, affordable software that requires minimal effort to manage. The software can be deployed in virtual, hosted cloud, on-premises, or hybrid network environments. The company sells its software and services directly and through a network of global channel partners. For more information, visit [www.mdaemon.com](https://www.altn.com/). Copyright © 1996-2026 MDaemon Technologies.  View [privacy policy](https://mdaemon.com/policies/privacy-policy).   ###### Contact Us +1.817-601-3222 [sales@help.mdaemon.com](mailto:sales@help.mdaemon.com) 6340 Lake Worth Blvd. Fort Worth, TX 76135 ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Brad Wyro", "url" : "https://blog.mdaemon.com/author/brad-wyro" }, "dateModified" : "2026-11-13T20:13:35.270Z", "datePublished" : "2026-11-13T20:04:30.000Z", "headline" : "Microsoft 365 Outage: Is Your Business Email Ready for the Next One?", "image" : [ "https://blog.mdaemon.com/hubfs/M365-down-featured-image-captioned.png" ], "mainEntityOfPage" : { "@id" : "https://blog.mdaemon.com/microsoft-365-outage-is-your-business-email-ready-for-the-next-one", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://blog.mdaemon.com/hubfs/MDaemon-Technologies_logo_large.png" }, "name" : "MDaemon Technologies" } } ```