{"id":41483,"date":"2026-11-13T11:11:41","date_gmt":"2026-11-13T10:11:41","guid":{"rendered":"https:\/\/www.retarus.com\/blog\/?p=41483"},"modified":"2026-11-13T15:06:32","modified_gmt":"2026-11-13T14:06:32","slug":"ce-que-revele-cette-nouvelle-panne-de-ms-365-sur-la-dependance-a-la-messagerie-electronique","status":"publish","type":"post","link":"https:\/\/www.retarus.com\/blog\/fr\/ce-que-revele-cette-nouvelle-panne-de-ms-365-sur-la-dependance-a-la-messagerie-electronique\/","title":{"rendered":"Ce que r\u00e9v\u00e8le cette nouvelle panne de MS 365 sur la d\u00e9pendance \u00e0 la messagerie \u00e9lectronique"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Une panne \u00e0 grande \u00e9chelle affectant Microsoft 365 montre une nouvelle fois \u00e0 quel point les entreprises d\u00e9pendent de la disponibilit\u00e9 des services cloud essentiels. Depuis hier soir, Exchange Online, Teams, SharePoint, Copilot et Defender XDR, entre autres, sont touch\u00e9s, comme <a href=\"https:\/\/www.it-connect.fr\/panne-mondiale-microsoft-365-exchange-online-outlook-teams\/\" data-type=\"link\" data-id=\"https:\/\/www.it-connect.fr\/panne-mondiale-microsoft-365-exchange-online-outlook-teams\/\">le rapporte <em>IT Connect<\/em><\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Selon Microsoft, un nombre inhabituellement \u00e9lev\u00e9 de serveurs a subi une panne inattendue. La charge suppl\u00e9mentaire qui en a r\u00e9sult\u00e9 pour l&rsquo;infrastructure restante a encore aggrav\u00e9 la perturbation. Cet incident montre clairement \u00e0 quel point les cons\u00e9quences peuvent \u00eatre importantes lorsque plusieurs services essentiels \u00e0 l&rsquo;activit\u00e9 d\u00e9pendent d&rsquo;une m\u00eame infrastructure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Une panne de fournisseur, de nombreuses r\u00e9percussions<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette nouvelle panne met en \u00e9vidence le r\u00f4le central que joue la messagerie \u00e9lectronique dans le fonctionnement de nombreuses entreprises. Les offres, les factures, les validations et les demandes des clients transitent par e-mail. Si Exchange Online n\u2019est pas disponible, une grande partie des activit\u00e9s quotidiennes est paralys\u00e9e. Et ce, m\u00eame lorsque d\u2019autres services fonctionnent \u00e0 nouveau. En effet, m\u00eame si Exchange Online est \u00e0 nouveau en mesure de traiter les messages entrants, cela s\u2019accompagne parfois de retards importants, comme le montrent les exp\u00e9riences tir\u00e9es de <a href=\"https:\/\/www.retarus.com\/blog\/fr\/quand-meme-microsoft-sarrete-les-lecons-tirees-des-recentes-pannes-de-messagerie\/\">pannes ant\u00e9rieures<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>La redondance n\u2019est pas synonyme d\u2019ind\u00e9pendance<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cet incident met en \u00e9vidence les limites des concepts de redondance classiques : des capacit\u00e9s suppl\u00e9mentaires ou des centres de donn\u00e9es redondants au sein de la m\u00eame infrastructure de fournisseur ne suffisent pas en cas de perturbations de grande ampleur. Ce qui est d\u00e9terminant, c\u2019est plut\u00f4t un v\u00e9ritable syst\u00e8me de secours ind\u00e9pendant : un syst\u00e8me de messagerie d\u2019urgence totalement dissoci\u00e9 du fournisseur de messagerie principal et de son infrastructure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u2019est la seule fa\u00e7on de garantir que les communications critiques pour l\u2019activit\u00e9 se poursuivent m\u00eame lorsque le fournisseur habituel est touch\u00e9 par une panne g\u00e9n\u00e9ralis\u00e9e.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette ind\u00e9pendance rev\u00eat \u00e9galement une importance croissante dans le contexte des exigences de la directive NIS2. Les entit\u00e9s concern\u00e9es doivent mettre en place des mesures appropri\u00e9es pour assurer la continuit\u00e9 des op\u00e9rations et g\u00e9rer les incidents de s\u00e9curit\u00e9. Cela implique notamment de s\u00e9curiser les canaux de communication critiques en cas d\u2019urgence.<\/p>\n\n\n\n<figure data-wp-context=\"{&quot;imageId&quot;:&quot;6af72080be7e0&quot;}\" data-wp-interactive=\"core\/image\" data-wp-key=\"6af72080be7e0\" 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>Acc\u00e8s \u00e0 tout moment et o\u00f9 que vous soyez : en cas d&rsquo;urgence, vous pouvez \u00e9galement acc\u00e9der aux messageries en ligne depuis des appareils mobiles<\/em>.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">C&rsquo;est pr\u00e9cis\u00e9ment l\u00e0 qu&rsquo;intervient <a href=\"https:\/\/www.retarus.com\/de\/products\/email-security\/email-continuity\/\">Retarus Email Continuity<\/a>: cette solution fonctionne ind\u00e9pendamment de l&rsquo;infrastructure de messagerie principale et est h\u00e9berg\u00e9e dans des centres de donn\u00e9es certifi\u00e9s situ\u00e9s au sein de l&rsquo;UE.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En cas de panne du syst\u00e8me de messagerie habituel, les collaborateurs disposent d\u2019une bo\u00eete mail Web distincte. Ils peuvent ainsi continuer \u00e0 envoyer et \u00e0 recevoir des messages via leurs adresses e-mail habituelles, y compris depuis des appareils mobiles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vous souhaitez s\u00e9curiser de mani\u00e8re ind\u00e9pendante votre communication par e-mail, essentielle \u00e0 votre activit\u00e9 ? <a href=\"https:\/\/www.retarus.com\/de\/contact\/?interest=4#general-inquiry\">Contactez-nous<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une panne \u00e0 grande \u00e9chelle de Microsoft 365 montre une nouvelle fois \u00e0 quel point les entreprises d\u00e9pendent de la disponibilit\u00e9 des services cloud essentiels. <\/p>\n","protected":false},"author":12,"featured_media":41484,"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":[4,3051],"tags":[1579,1244],"ret_content_type":[],"class_list":["post-41483","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe","category-securite-des-emails","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>Ce que r\u00e9v\u00e8le cette nouvelle panne de MS 365 sur la d\u00e9pendance \u00e0 la messagerie \u00e9lectronique | Retarus Blog<\/title>\n<meta name=\"description\" content=\"Une panne \u00e0 grande \u00e9chelle de Microsoft 365 montre une nouvelle fois \u00e0 quel point les entreprises 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