{"id":41473,"date":"2026-11-13T11:11:41","date_gmt":"2026-11-13T10:11:41","guid":{"rendered":"https:\/\/www.retarus.com\/blog\/?p=41473"},"modified":"2026-11-13T11:11:45","modified_gmt":"2026-11-13T10:11:45","slug":"was-der-erneute-ms-365-ausfall-ueber-e-mail-abhaengigkeiten-verraet","status":"publish","type":"post","link":"https:\/\/www.retarus.com\/blog\/de\/was-der-erneute-ms-365-ausfall-ueber-e-mail-abhaengigkeiten-verraet\/","title":{"rendered":"Was der erneute MS 365 Ausfall \u00fcber E-Mail-Abh\u00e4ngigkeiten verr\u00e4t"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Eine gro\u00dffl\u00e4chige St\u00f6rung bei Microsoft 365 zeigt erneut, wie abh\u00e4ngig Unternehmen von der Verf\u00fcgbarkeit zentraler Cloud-Dienste sind. Betroffen sind seit gestern Abend unter anderem Exchange Online, Teams, SharePoint, Copilot und Defender XDR, wie <a href=\"https:\/\/www.heise.de\/news\/Microsoft-365-Stoerung-Serverausfaelle-legen-Teams-Exchange-und-Copilot-lahm-11523565.html\">heise online berichtet<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nach Angaben von Microsoft fiel eine ungew\u00f6hnlich hohe Zahl von Servern unerwartet aus. Die dadurch entstehende Mehrbelastung der verbleibenden Infrastruktur versch\u00e4rfte die St\u00f6rung zus\u00e4tzlich. Der Vorfall macht deutlich, wie weitreichend die Folgen sein k\u00f6nnen, wenn mehrere gesch\u00e4ftskritische Dienste von derselben Infrastruktur abh\u00e4ngen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ein Provider-Ausfall, viele Folgen<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Der erneute Ausfall macht deutlich, welche zentrale Rolle E-Mail f\u00fcr den Gesch\u00e4ftsbetrieb vieler Unternehmen spielt. \u00dcber E-Mail laufen Angebote, Rechnungen, Freigaben und Kundenanfragen. Ist Exchange Online nicht verf\u00fcgbar, kommt ein gro\u00dfer Teil des tagesgesch\u00e4fts zum Stillstand. Auch dann noch, wenn andere Dienste wieder funktionieren. Denn wenn Exchange Online grunds\u00e4tzlich wieder eingehende Nachrichten verarbeiten kann, geschieht das mit zum Teil deutlichen Verz\u00f6gerungen, wie die Erfahrungen aus <a href=\"https:\/\/www.retarus.com\/blog\/de\/wenn-selbst-microsoft-ins-stocken-geraet-lektionen-aus-aktuellen-e-mail-ausfaellen\/\">fr\u00fcheren Ausf\u00e4llen<\/a> zeigen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Redundanz ist nicht dasselbe wie Unabh\u00e4ngigkeit<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Der aktuelle Vorfall verdeutlicht die Grenzen klassischer Redundanzkonzepte: Zus\u00e4tzliche Kapazit\u00e4ten oder redundante Rechenzentren innerhalb derselben Anbieterinfrastruktur reichen bei weitreichenden St\u00f6rungen nicht aus. Entscheidend ist vielmehr ein echter unabh\u00e4ngiger Fallback: ein Notfall-E-Mail-System, das vollst\u00e4ndig vom prim\u00e4ren E-Mail-Anbieter und dessen Infrastruktur entkoppelt ist.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nur so l\u00e4sst sich sicherstellen, dass die gesch\u00e4ftskritische Kommunikation auch dann weiterl\u00e4uft, wenn der regul\u00e4re Provider von einem umfassenden Outage betroffen ist.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Auch im Kontext der NIS2-Anforderungen gewinnt diese Unabh\u00e4ngigkeit an Bedeutung. Betroffene Einrichtungen m\u00fcssen geeignete Ma\u00dfnahmen zur Aufrechterhaltung des Betriebs und zur Bew\u00e4ltigung von Sicherheitsvorf\u00e4llen etablieren. Dazu geh\u00f6rt auch, kritische Kommunikationswege f\u00fcr den Notfall abzusichern.<\/p>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6af6ecc1986c6&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6af6ecc1986c6\" 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>Zugriff jederzeit von jedem Ort: Die Webmailer sind im Notfall auch \u00fcber mobile Endger\u00e4te zu erreichen<\/em>.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Genau hier setzt <a href=\"https:\/\/www.retarus.com\/de\/products\/email-security\/email-continuity\/\">Retarus Email Continuity<\/a> an: Die L\u00f6sung arbeitet unabh\u00e4ngig von der prim\u00e4ren E-Mail-Infrastruktur und wird in zertifizierten Rechenzentren innerhalb der EU betrieben.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bei einem Ausfall des regul\u00e4ren E-Mail-Systems steht Mitarbeitern ein separates Webmail-Postfach zur Verf\u00fcgung. So k\u00f6nnen sie \u00fcber ihre gewohnten E-Mail-Adressen weiterhin Nachrichten senden und empfangen \u2013 auch \u00fcber mobile Endger\u00e4te.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sie m\u00f6chten Ihre gesch\u00e4ftskritische E-Mail-Kommunikation unabh\u00e4ngig absichern? <a href=\"https:\/\/www.retarus.com\/de\/contact\/?interest=4#general-inquiry\">Sprechen Sie mit uns<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Eine gro\u00dffl\u00e4chige St\u00f6rung bei Microsoft 365 zeigt erneut, wie abh\u00e4ngig Unternehmen von der Verf\u00fcgbarkeit zentraler Cloud-Dienste sind. <\/p>\n","protected":false},"author":12,"featured_media":20699,"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":[3056,3],"tags":[1057,665],"ret_content_type":[],"class_list":["post-41473","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-email-security","category-unkategorisiert","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>Was der erneute MS 365 Ausfall \u00fcber E-Mail-Abh\u00e4ngigkeiten verr\u00e4t | Retarus Blog<\/title>\n<meta name=\"description\" content=\"Eine gro\u00dffl\u00e4chige St\u00f6rung bei Microsoft 365 zeigt erneut, wie abh\u00e4ngig Unternehmen von der Verf\u00fcgbarkeit zentraler Cloud-Dienste 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