{"id":1221,"date":"2025-05-07T13:28:14","date_gmt":"2025-05-07T13:28:14","guid":{"rendered":"https:\/\/novadba.com\/microsoft-exchange-mailboxes-online-hybrid-or-local\/"},"modified":"2025-07-07T11:23:16","modified_gmt":"2025-07-07T15:23:16","slug":"boites-aux-lettres-microsoft-exchange-en-ligne-hybride-ou-locale","status":"publish","type":"post","link":"https:\/\/novadba.com\/fr\/boites-aux-lettres-microsoft-exchange-en-ligne-hybride-ou-locale\/","title":{"rendered":"Bo\u00eetes aux lettres Microsoft Exchange : en ligne, hybride ou locale?"},"content":{"rendered":"\n<p><strong>En Am\u00e9rique du Nord aujourd\u2019hui, un grand nombre d\u2019organisations continuent de s\u2019appuyer sur Microsoft Exchange comme plateforme de messagerie principale. L\u2019une des raisons pour lesquelles Exchange a acquis une telle pr\u00e9sence sur le march\u00e9 est son int\u00e9gration transparente avec les environnements Windows Active Directory.<\/strong><\/p>\n\n\n\n<p>Si votre organisation a \u00e9t\u00e9 fond\u00e9e avant l\u2019\u00e9mergence des services infonuagiques modernes, il y a de fortes chances que vous utilisiez encore un serveur Exchange local pour fournir les communications par courriel.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fin du support : Exchange Server 2016 et 2019<\/h2>\n\n\n\n<p>Avec l\u2019annonce r\u00e9cente de Microsoft selon laquelle Exchange Server 2016 et 2019 atteindront la fin du support le 14 octobre 2025, de nombreuses organisations utilisant Exchange sur site devront planifier une mise \u00e0 niveau vers Exchange Server Subscription Edition (SE).<\/p>\n\n\n\n<p>Mais cela soul\u00e8ve une question importante : une autre mise \u00e0 niveau d\u2019Exchange en vaut-elle vraiment la peine?<\/p>\n\n\n\n<p>Pour y r\u00e9pondre, examinons quelques consid\u00e9rations cl\u00e9s :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Microsoft a chang\u00e9 la convention de nommage pour les serveurs Exchange. Cela signifie-t-il qu\u2019Exchange SE est une plateforme radicalement diff\u00e9rente?<\/li>\n\n\n\n<li>Microsoft recommande fortement de migrer vers Exchange Online. Qu\u2019est-ce que cela implique au-del\u00e0 du fait que \u00ab les bo\u00eetes aux lettres sont dans le nuage \u00bb?<\/li>\n\n\n\n<li>Votre organisation est-elle d\u00e9j\u00e0 en mode hybride? Quelles sont les prochaines \u00e9tapes et options?<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Quoi de neuf dans Exchange Server Subscription Edition (SE)?<\/h3>\n\n\n\n<p>Si vous utilisez actuellement Exchange Server 2019 CU15, vous constaterez que la plupart de ses fonctionnalit\u00e9s sont reprises dans SE. Techniquement, si votre syst\u00e8me peut ex\u00e9cuter CU15, vous ne devriez rencontrer aucun probl\u00e8me majeur de compatibilit\u00e9 avec SE.<\/p>\n\n\n\n<p>Le changement le plus notable est le mod\u00e8le de licence de Microsoft, similaire \u00e0 ce qui a d\u00e9j\u00e0 \u00e9t\u00e9 fait avec SharePoint Server. Si vous envisagez de rester sur site avec votre d\u00e9ploiement Exchange, ce changement vous concernera. Si vous migrez vers Exchange Online ou op\u00e9rez en mode hybride, le changement de licence n\u2019aura aucun impact.<\/p>\n\n\n\n<p>Exchange Server SE est \u00e9galement la premi\u00e8re version \u00e0 prendre en charge Windows Server 2025. Ainsi, m\u00eame si vous ne vous inqui\u00e9tez pas de la fin de vie de votre version actuelle d\u2019Exchange, pensez \u00e0 combien de temps vous pourrez encore l\u2019ex\u00e9cuter sur une version de Windows Server prise en charge.<\/p>\n\n\n\n<p>\u00c0 noter \u00e9galement : la prise en charge de TLS 1.3, introduite avec CU15. C\u2019est un incontournable pour les communications s\u00e9curis\u00e9es dans un paysage de menaces en constante \u00e9volution.<\/p>\n\n\n\n<p>Cela dit, nous savons tous que les mises \u00e0 niveau Exchange peuvent parfois \u00eatre complexes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pourquoi Microsoft recommande de passer \u00e0 Exchange Online<\/h3>\n\n\n\n<p>Microsoft a \u00e9t\u00e9 clair dans ses directives. Migrez vers Exchange Online si possible. Et la plupart des organisations sont ouvertes \u00e0 cette id\u00e9e. Surtout en consid\u00e9rant la mani\u00e8re dont des services comme Microsoft Teams, OneDrive for Business et d\u2019autres outils de l\u2019\u00e9cosyst\u00e8me Microsoft 365 am\u00e9liorent la productivit\u00e9 et la collaboration, avec de faibles co\u00fbts de d\u00e9ploiement et de maintenance.<\/p>\n\n\n\n<p>Mais migrer vers Exchange Online ou choisir entre hybride et 100\u202f% en ligne, demande une compr\u00e9hension approfondie de votre environnement.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Consid\u00e9rations techniques cl\u00e9s<\/h3>\n\n\n\n<p>Si vous avez d\u00e9j\u00e0 d\u00e9ploy\u00e9 un serveur Exchange local, votre sch\u00e9ma Active Directory a probablement \u00e9t\u00e9 \u00e9tendu avec des attributs Exchange. Ces attributs sont :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Utilis\u00e9s pour g\u00e9rer les param\u00e8tres des bo\u00eetes aux lettres<\/strong><\/li>\n\n\n\n<li><strong>Maintenus via les outils de gestion Exchange<\/strong><\/li>\n\n\n\n<li><strong>Non supprimables d\u2019Active Directory une fois ajout\u00e9s<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Cela cr\u00e9e certaines limites pour supprimer compl\u00e8tement Exchange de votre environnement local.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Le parcours de migration recommand\u00e9 par Microsoft<\/h3>\n\n\n\n<p>Microsoft recommande d\u2019utiliser deux outils pour la migration Exchange :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/docs.azure.cn\/en-us\/entra\/identity\/hybrid\/connect\/whatis-azure-ad-connect\"><strong>Entra ID Connect<\/strong> <\/a>(anciennement Azure AD Connect)<br>\u2192 Synchronise les utilisateurs, groupes et mots de passe depuis Active Directory local vers Microsoft 365<\/li>\n\n\n\n<li><strong>Configuration<\/strong> <strong>Exchange hybride<\/strong><br>\u2192 \u00c9tablit l\u2019int\u00e9gration entre votre serveur Exchange local et Exchange Online<\/li>\n<\/ul>\n\n\n\n<p>Cette configuration permet un mode hybride, offrant une exp\u00e9rience de migration progressive et \u00e0 faible impact pour les utilisateurs.<\/p>\n\n\n\n<p>Une fois la migration termin\u00e9e et toutes les bo\u00eetes aux lettres dans Exchange Online, vous devez prendre une d\u00e9cision :<\/p>\n\n\n\n<p><strong><em>Rester en mode hybride ou passer \u00e0 un mod\u00e8le uniquement en ligne?<\/em><\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Les compromis du mode hybride<\/h3>\n\n\n\n<p>Rester en mode hybride comporte une contrainte majeure : vous devez g\u00e9rer les bo\u00eetes aux lettres via votre serveur Exchange local.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Certains attributs des bo\u00eetes aux lettres dans Exchange Online seront \u00ab gris\u00e9s \u00bb et non modifiables<\/li>\n\n\n\n<li>Les nouvelles bo\u00eetes aux lettres doivent \u00eatre cr\u00e9\u00e9es localement, puis synchronis\u00e9es<\/li>\n\n\n\n<li>Les administrateurs doivent veiller \u00e0 ne pas contourner ce processus, sous peine de briser la gestion centralis\u00e9e et de cr\u00e9er des incoh\u00e9rences dans le comportement et la configuration des bo\u00eetes aux lettres<\/li>\n<\/ul>\n\n\n\n<p>En pratique, vous maintenez votre serveur Exchange local uniquement \u00e0 des fins administratives, ce qui ajoute une surcharge et une complexit\u00e9 de formation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Passer au mode uniquement en ligne<\/h3>\n\n\n\n<p>Si vous utilisez Entra ID Connect et Exchange Hybrid, vous \u00eates en mode hybride. Passer au mode uniquement en ligne comporte certains d\u00e9fis :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Entra ID Connect synchronise les attributs Exchange, ce qui limite la gestion des bo\u00eetes aux lettres dans le nuage<\/li>\n\n\n\n<li>Supprimer Entra ID Connect rompt la synchronisation des comptes et des mots de passe<\/li>\n\n\n\n<li>Les nouveaux utilisateurs devront \u00eatre cr\u00e9\u00e9s \u00e0 la fois localement et dans Microsoft 365<\/li>\n<\/ul>\n\n\n\n<p>Cela peut entra\u00eener une duplication administrative et une perte d\u2019un approvisionnement centralis\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Solutions de contournement et leurs implications<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Option 1 : Utiliser Entra ID Connect sans Exchange Hybrid pendant la migration<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cette m\u00e9thode synchronise les utilisateurs, groupes et mots de passe, mais ne g\u00e8re pas les attributs Exchange dans Exchange Online<\/li>\n\n\n\n<li>Les nouveaux utilisateurs cr\u00e9\u00e9s sur site sont synchronis\u00e9s avec Microsoft 365<\/li>\n\n\n\n<li>Une fois sous licence, les bo\u00eetes aux lettres sont provisionn\u00e9es dans Exchange Online<\/li>\n\n\n\n<li>Toute la gestion peut se faire dans le cloud<\/li>\n<\/ul>\n\n\n\n<p><strong>Inconv\u00e9nients :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Le processus de migration est manuel et moins flexible<\/li>\n\n\n\n<li>Il vous faudra probablement un outil de migration tiers<\/li>\n\n\n\n<li>La migration des bo\u00eetes aux lettres et des \u00e9l\u00e9ments peut n\u00e9cessiter plus de planification et de configuration manuelle<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Option 2 : Effectuer une migration hybride compl\u00e8te avec les deux outils recommand\u00e9s par Microsoft, puis supprimer Exchange Server (non pris en charge)<\/h4>\n\n\n\n<p>Certaines organisations effectuent la migration hybride comme recommand\u00e9 (Hybride + Entra ID Connect), puis suppriment leur serveur Exchange local.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Les attributs Exchange peuvent \u00eatre g\u00e9r\u00e9s via des outils Active Directory ou des scripts PowerShell personnalis\u00e9s<\/li>\n\n\n\n<li>Cette configuration n\u2019est pas officiellement prise en charge par Microsoft<\/li>\n<\/ul>\n\n\n\n<p><strong>Risques :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Le support Microsoft peut exiger une configuration hybride fonctionnelle pour aider en cas de probl\u00e8me futur<\/li>\n\n\n\n<li>La gestion des bo\u00eetes aux lettres devient incoh\u00e9rente entre les nouveaux utilisateurs (en ligne uniquement) et ceux migr\u00e9s (hybrides)<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Option 3 : Utiliser une solution de synchronisation d\u2019annuaire tierce<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Migrer comme recommand\u00e9 (Hybride + Entra ID Connect)<\/li>\n\n\n\n<li>Une fois termin\u00e9, supprimer Entra ID Connect, Exchange Hybrid et les serveurs Exchange locaux. Ensuite, remplacer Entra ID Connect par un outil de synchronisation tiers<\/li>\n<\/ul>\n\n\n\n<p>Cela permet de conserver la synchronisation des mots de passe et des comptes, d\u2019\u00e9viter les contraintes de l\u2019Hybride Exchange, et de prendre en charge un mod\u00e8le uniquement en ligne.<\/p>\n\n\n\n<p><strong>Compromis :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Logiciel suppl\u00e9mentaire \u00e0 d\u00e9ployer et \u00e0 maintenir<\/li>\n\n\n\n<li>Co\u00fbt de licence pour la solution tierce<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion : quelle est la meilleure option pour votre organisation?<\/h3>\n\n\n\n<p>Faut-il mettre \u00e0 jour Exchange Server? Passer enti\u00e8rement en ligne? Rester en mode hybride?<\/p>\n\n\n\n<p>Il n\u2019y a pas de solution unique. Cela d\u00e9pend de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>V<strong>otre environnement technique<\/strong><\/li>\n\n\n\n<li><strong>Votre strat\u00e9gie de licences<\/strong><\/li>\n\n\n\n<li><strong>Vos ressources et expertises internes<\/strong><\/li>\n\n\n\n<li><strong>Vos priorit\u00e9s d\u2019affaires<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Si vous avez besoin de conseils pour naviguer parmi ces d\u00e9cisions, des sp\u00e9cialistes Exchange peuvent vous aider \u00e0 \u00e9valuer vos besoins, concevoir la bonne strat\u00e9gie et accompagner votre transition.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>En Am\u00e9rique du Nord aujourd\u2019hui, un grand nombre d\u2019organisations continuent de s\u2019appuyer sur Microsoft Exchange comme plateforme de messagerie principale. L\u2019une des raisons pour lesquelles Exchange a acquis une telle pr\u00e9sence sur le march\u00e9 est son int\u00e9gration transparente avec les environnements Windows Active Directory. Si votre organisation a \u00e9t\u00e9 fond\u00e9e avant l\u2019\u00e9mergence des services infonuagiques [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":1266,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[89],"tags":[255,253,243,244,246,256,248,254,251,252],"class_list":["post-1221","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-infrastructure","tag-active-directory-2","tag-entra-id-connect","tag-exchange-fr","tag-exchange-server-fr","tag-local-fr","tag-microsoft","tag-microsoft-exchange-fr","tag-mode-hybride","tag-support-fr","tag-windows-server-2025-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Bo\u00eetes aux lettres Microsoft Exchange : en ligne, hybride ou locale? - Nova 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