{"id":41487,"date":"2026-11-13T11:11:41","date_gmt":"2026-11-13T10:11:41","guid":{"rendered":"https:\/\/www.retarus.com\/blog\/?p=41487"},"modified":"2026-11-13T13:36:01","modified_gmt":"2026-11-13T12:36:01","slug":"what-the-latest-ms-365-outage-reveals-about-email-dependencies","status":"publish","type":"post","link":"https:\/\/www.retarus.com\/blog\/en\/what-the-latest-ms-365-outage-reveals-about-email-dependencies\/","title":{"rendered":"What the Latest MS 365 Outage Reveals About Email Dependencies"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A widespread outage affecting Microsoft 365 highlights, once again, how dependent companies are on the availability of key cloud services. As <a href=\"https:\/\/www.heise.de\/news\/Microsoft-365-Stoerung-Serverausfaelle-legen-Teams-Exchange-und-Copilot-lahm-11523565.html\">reported by heise online<\/a>, services affected since yesterday evening include Exchange Online, Teams, SharePoint, Copilot, and Defender XDR, among others.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">According to Microsoft, an unusually high number of servers failed unexpectedly. The resulting additional strain on the remaining infrastructure further exacerbated the disruption. The incident highlights just how far-reaching the consequences can be when multiple business-critical services depend on the same infrastructure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>One Provider Outage, Many Consequences<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This latest outage underscores the central role that email plays in the business operations of many companies. Quotes, invoices, approvals, and customer inquiries all flow through email. If Exchange Online is unavailable, a large part of day-to-day business comes to a standstill. This is true even when other services are back up and running. That\u2019s because, even when Exchange Online is able to process incoming messages again, there are often significant delays, as experience from <a href=\"https:\/\/www.retarus.com\/blog\/en\/when-even-microsoft-comes-to-a-halt-lessons-learned-from-the-recent-email-outages\/\">previous outages<\/a> has shown.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Redundancy is not the same as independence<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The recent incident highlights the limitations of traditional redundancy concepts: Additional capacity or redundant data centers within the same provider\u2019s infrastructure are not sufficient in the event of widespread disruptions. What is crucial, rather, is a truly independent fallback: an emergency email system that is completely decoupled from the primary email provider and its infrastructure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is the only way to ensure that business-critical communication continues even if the regular provider is affected by a widespread outage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This independence is also gaining importance in the context of NIS2 requirements. Affected organizations must establish appropriate measures to maintain operations and manage security incidents. This includes securing critical communication channels for emergencies.<\/p>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6af70d2279dc5&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6af70d2279dc5\" class=\"wp-block-image aligncenter size-large wp-lightbox-container\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"355\" data-wp-class--hide=\"state.isContentHidden\" data-wp-class--show=\"state.isContentVisible\" data-wp-init=\"callbacks.setButtonStyles\" data-wp-on--click=\"actions.showLightbox\" data-wp-on--load=\"callbacks.setButtonStyles\" data-wp-on--pointerdown=\"actions.preloadImage\" data-wp-on--pointerenter=\"actions.preloadImageWithDelay\" data-wp-on--pointerleave=\"actions.cancelPreload\" data-wp-on-window--resize=\"callbacks.setButtonStyles\" src=\"https:\/\/www.retarus.com\/blog\/wp-content\/uploads\/sites\/41\/2026\/11\/retarus_email-continuity_mobile-2048x709-1-1024x355.png\" alt=\"\" class=\"wp-image-41476\" srcset=\"https:\/\/www.retarus.com\/blog\/wp-content\/uploads\/sites\/41\/2026\/11\/retarus_email-continuity_mobile-2048x709-1-1024x355.png 1024w, https:\/\/www.retarus.com\/blog\/wp-content\/uploads\/sites\/41\/2026\/11\/retarus_email-continuity_mobile-2048x709-1-300x104.png 300w, https:\/\/www.retarus.com\/blog\/wp-content\/uploads\/sites\/41\/2026\/11\/retarus_email-continuity_mobile-2048x709-1-765x265.png 765w, https:\/\/www.retarus.com\/blog\/wp-content\/uploads\/sites\/41\/2026\/11\/retarus_email-continuity_mobile-2048x709-1-1536x532.png 1536w, https:\/\/www.retarus.com\/blog\/wp-content\/uploads\/sites\/41\/2026\/11\/retarus_email-continuity_mobile-2048x709-1.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><button\n\t\t\tclass=\"lightbox-trigger\"\n\t\t\ttype=\"button\"\n\t\t\taria-haspopup=\"dialog\"\n\t\t\tdata-wp-bind--aria-label=\"state.thisImage.triggerButtonAriaLabel\"\n\t\t\tdata-wp-init=\"callbacks.initTriggerButton\"\n\t\t\tdata-wp-on--click=\"actions.showLightbox\"\n\t\t\tdata-wp-style--right=\"state.thisImage.buttonRight\"\n\t\t\tdata-wp-style--top=\"state.thisImage.buttonTop\"\n\t\t>\n\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"12\" height=\"12\" fill=\"none\" viewBox=\"0 0 12 12\">\n\t\t\t\t<path fill=\"#fff\" d=\"M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z\" \/>\n\t\t\t<\/svg>\n\t\t<\/button><figcaption class=\"wp-element-caption\"><em>Access anytime, anywhere: In an emergency, you can also access the webmail services from mobile devices<\/em>.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This is exactly where <a href=\"https:\/\/www.retarus.com\/products\/email-security\/email-continuity\/\" data-type=\"link\" data-id=\"https:\/\/www.retarus.com\/products\/email-security\/email-continuity\/\">Retarus Email Continuity<\/a> shines. The solution operates independently of the primary email infrastructure and is hosted in certified data centers within the EU.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In the event of an outage of the regular email system, employees have access to a separate webmail account. This allows them to continue sending and receiving messages using their usual email addresses, even on mobile devices.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Would you like to secure your business-critical email communications independently? <a href=\"https:\/\/www.retarus.com\/contact\/?interest=4#general-inquiry\">Talk to us<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A widespread outage affecting Microsoft 365 once again highlights how dependent businesses are on the availability of key cloud services. <\/p>\n","protected":false},"author":12,"featured_media":6691,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ret_read_more_text":"","ret_thumb_border":false,"footnotes":""},"categories":[3043,1],"tags":[444,43],"ret_content_type":[],"class_list":["post-41487","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-email-security","category-uncategorized","tag-email-continuity","tag-email-security"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What the Latest MS 365 Outage Reveals About Email Dependencies | Retarus Blog<\/title>\n<meta name=\"description\" content=\"A widespread outage affecting Microsoft 365 once again highlights how dependent businesses are on the availability of key cloud services.\" \/>\n<meta name=\"robots\" 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