{"id":6098,"date":"2025-10-16T16:06:06","date_gmt":"2025-10-16T16:06:06","guid":{"rendered":"https:\/\/aetsolutions.ca\/?p=930"},"modified":"2026-04-09T09:01:21","modified_gmt":"2026-04-09T09:01:21","slug":"les-etapes-cachees-dune-migration-microsoft-365-qui-retardent-la-mise-en-production","status":"publish","type":"post","link":"https:\/\/dev.aetsolutions.ca\/fr\/les-etapes-cachees-dune-migration-microsoft-365-qui-retardent-la-mise-en-production\/","title":{"rendered":"Les \u00e9tapes cach\u00e9es d\u2019une migration Microsoft 365 qui retardent la mise en production"},"content":{"rendered":"<p data-start=\"87\" data-end=\"557\">De nombreuses entreprises montr\u00e9alaises ont d\u00e9j\u00e0 v\u00e9cu ce cauchemar : tout est planifi\u00e9 pour une coupure le vendredi soir afin de migrer vers Microsoft 365, mais le lundi matin, les employ\u00e9s ne peuvent toujours pas se connecter, les courriels sont retard\u00e9s, ou les r\u00e9unions Teams ont disparu.<br data-start=\"378\" data-end=\"381\" \/>Le vrai probl\u00e8me ? Ce n\u2019est g\u00e9n\u00e9ralement pas l\u2019outil de migration ni Microsoft lui-m\u00eame, mais plut\u00f4t les \u00e9tapes de pr\u00e9paration invisibles qui ont \u00e9t\u00e9 oubli\u00e9es avant la coupure.<\/p>\n<h3 data-start=\"564\" data-end=\"646\"><strong data-start=\"568\" data-end=\"646\">Phase de d\u00e9couverte : domaines, locataires, licences, ressources partag\u00e9es<\/strong><\/h3>\n<p data-start=\"648\" data-end=\"740\">Une migration r\u00e9ussie commence par une phase de d\u00e9couverte compl\u00e8te. Il faut cartographier :<\/p>\n<ul data-start=\"742\" data-end=\"1139\">\n<li data-start=\"742\" data-end=\"833\">\n<p data-start=\"744\" data-end=\"833\"><strong data-start=\"744\" data-end=\"758\">Domaines :<\/strong> v\u00e9rifier la propri\u00e9t\u00e9, les enregistrements DNS et l\u2019alignement SPF\/DKIM.<\/p>\n<\/li>\n<li data-start=\"834\" data-end=\"935\">\n<p data-start=\"836\" data-end=\"935\"><strong data-start=\"836\" data-end=\"852\">Locataires :<\/strong> consolidation de plusieurs locataires ou migration depuis un autre fournisseur ?<\/p>\n<\/li>\n<li data-start=\"936\" data-end=\"1017\">\n<p data-start=\"938\" data-end=\"1017\"><strong data-start=\"938\" data-end=\"952\">Licences :<\/strong> choisir les bons SKU M365 selon les besoins actuels et futurs.<\/p>\n<\/li>\n<li data-start=\"1018\" data-end=\"1139\">\n<p data-start=\"1020\" data-end=\"1139\"><strong data-start=\"1020\" data-end=\"1046\">Ressources partag\u00e9es :<\/strong> listes de distribution, bo\u00eetes aux lettres partag\u00e9es, dossiers publics \u2013 souvent n\u00e9glig\u00e9s.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"1146\" data-end=\"1210\"><strong data-start=\"1150\" data-end=\"1210\">Identit\u00e9 et s\u00e9curit\u00e9 : Entra ID, MFA, acc\u00e8s conditionnel<\/strong><\/h3>\n<p data-start=\"1212\" data-end=\"1305\">L\u2019identit\u00e9 est la colonne vert\u00e9brale de Microsoft 365. Avant la migration, assurez-vous que :<\/p>\n<ul data-start=\"1307\" data-end=\"1617\">\n<li data-start=\"1307\" data-end=\"1411\">\n<p data-start=\"1309\" data-end=\"1411\">La synchronisation avec <strong data-start=\"1333\" data-end=\"1351\">Azure Entra ID<\/strong> ou l\u2019identit\u00e9 \u00ab cloud only \u00bb est correctement configur\u00e9e.<\/p>\n<\/li>\n<li data-start=\"1412\" data-end=\"1506\">\n<p data-start=\"1414\" data-end=\"1506\">L\u2019<strong data-start=\"1416\" data-end=\"1455\">authentification multifacteur (MFA)<\/strong> est activ\u00e9e sans bloquer les comptes de service.<\/p>\n<\/li>\n<li data-start=\"1507\" data-end=\"1617\">\n<p data-start=\"1509\" data-end=\"1617\">Les <strong data-start=\"1513\" data-end=\"1544\">r\u00e8gles d\u2019acc\u00e8s conditionnel<\/strong> ne bloquent pas les employ\u00e9s \u00e0 distance pendant la mise en production.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"1624\" data-end=\"1706\"><strong data-start=\"1628\" data-end=\"1706\">Cartographie des donn\u00e9es : bo\u00eetes aux lettres, SharePoint, OneDrive, Teams<\/strong><\/h3>\n<p data-start=\"1708\" data-end=\"1805\">Les donn\u00e9es ne se trouvent jamais \u00e0 un seul endroit. Au-del\u00e0 du courriel, il faut aussi pr\u00e9voir :<\/p>\n<ul data-start=\"1807\" data-end=\"2112\">\n<li data-start=\"1807\" data-end=\"1912\">\n<p data-start=\"1809\" data-end=\"1912\">Les <strong data-start=\"1813\" data-end=\"1848\">bo\u00eetes aux lettres utilisateurs<\/strong> et les <strong data-start=\"1856\" data-end=\"1868\">archives<\/strong> (PST, Exchange sur site ou export Gmail).<\/p>\n<\/li>\n<li data-start=\"1913\" data-end=\"1965\">\n<p data-start=\"1915\" data-end=\"1965\">Les <strong data-start=\"1919\" data-end=\"1939\">sites SharePoint<\/strong> et leurs autorisations.<\/p>\n<\/li>\n<li data-start=\"1966\" data-end=\"2038\">\n<p data-start=\"1968\" data-end=\"2038\">Les <strong data-start=\"1972\" data-end=\"1992\">espaces OneDrive<\/strong>, leurs quotas et le transfert de propri\u00e9t\u00e9.<\/p>\n<\/li>\n<li data-start=\"2039\" data-end=\"2112\">\n<p data-start=\"2041\" data-end=\"2112\">Les <strong data-start=\"2045\" data-end=\"2061\">canaux Teams<\/strong>, discussions priv\u00e9es et historique des r\u00e9unions.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"2119\" data-end=\"2178\"><strong data-start=\"2123\" data-end=\"2178\">Coexistence ou bascule compl\u00e8te : comment choisir ?<\/strong><\/h3>\n<p data-start=\"2180\" data-end=\"2251\">Faut-il migrer tout le monde d\u2019un coup (\u00ab big bang \u00bb) ou par \u00e9tapes ?<\/p>\n<ul data-start=\"2252\" data-end=\"2508\">\n<li data-start=\"2252\" data-end=\"2339\">\n<p data-start=\"2254\" data-end=\"2339\">La <strong data-start=\"2257\" data-end=\"2277\">bascule compl\u00e8te<\/strong> r\u00e9duit la complexit\u00e9, mais exige une pr\u00e9paration intensive.<\/p>\n<\/li>\n<li data-start=\"2340\" data-end=\"2508\">\n<p data-start=\"2342\" data-end=\"2508\">La <strong data-start=\"2345\" data-end=\"2360\">coexistence<\/strong> permet une transition progressive, mais requiert des connecteurs hybrides, la synchronisation d\u2019annuaires et des r\u00e8gles claires de collaboration.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"2515\" data-end=\"2561\"><strong data-start=\"2519\" data-end=\"2561\">Plan de communication et plan de repli<\/strong><\/h3>\n<p data-start=\"2563\" data-end=\"2620\">Aucune migration n\u2019est sans risque. Le succ\u00e8s d\u00e9pend de :<\/p>\n<ul data-start=\"2622\" data-end=\"2881\">\n<li data-start=\"2622\" data-end=\"2727\">\n<p data-start=\"2624\" data-end=\"2727\"><strong data-start=\"2624\" data-end=\"2650\">Communications claires<\/strong> avec le personnel concernant les horaires et les changements de connexion.<\/p>\n<\/li>\n<li data-start=\"2728\" data-end=\"2775\">\n<p data-start=\"2730\" data-end=\"2775\"><strong data-start=\"2730\" data-end=\"2744\">Formations<\/strong> avant et apr\u00e8s la migration.<\/p>\n<\/li>\n<li data-start=\"2776\" data-end=\"2881\">\n<p data-start=\"2778\" data-end=\"2881\"><strong data-start=\"2778\" data-end=\"2801\">Plan de repli test\u00e9<\/strong>, au cas o\u00f9 les changements DNS ou la synchronisation d\u2019identit\u00e9 \u00e9choueraient.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"2888\" data-end=\"2953\"><strong data-start=\"2892\" data-end=\"2953\">S\u00e9curisation post-migration : DLP, r\u00e9tention, sauvegardes<\/strong><\/h3>\n<p data-start=\"2955\" data-end=\"3048\">La mise en production n\u2019est que le d\u00e9but. Il faut ensuite s\u00e9curiser le nouvel environnement :<\/p>\n<ul data-start=\"3050\" data-end=\"3335\">\n<li data-start=\"3050\" data-end=\"3144\">\n<p data-start=\"3052\" data-end=\"3144\"><strong data-start=\"3052\" data-end=\"3108\">Politiques de pr\u00e9vention des fuites de donn\u00e9es (DLP)<\/strong> pour \u00e9viter les erreurs humaines.<\/p>\n<\/li>\n<li data-start=\"3145\" data-end=\"3225\">\n<p data-start=\"3147\" data-end=\"3225\"><strong data-start=\"3147\" data-end=\"3187\">R\u00e8gles de r\u00e9tention et de conformit\u00e9<\/strong> selon les exigences r\u00e9glementaires.<\/p>\n<\/li>\n<li data-start=\"3226\" data-end=\"3335\">\n<p data-start=\"3228\" data-end=\"3335\"><strong data-start=\"3228\" data-end=\"3251\">Sauvegardes tierces<\/strong>, car Microsoft prot\u00e8ge l\u2019infrastructure, mais pas vos suppressions accidentelles.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"3342\" data-end=\"3390\"><strong data-start=\"3346\" data-end=\"3390\">FAQ : Migration Microsoft 365 \u00e0 Montr\u00e9al<\/strong><\/h3>\n<p data-start=\"3392\" data-end=\"3709\"><strong data-start=\"3392\" data-end=\"3430\">Combien co\u00fbte une migration M365 ?<\/strong><br data-start=\"3430\" data-end=\"3433\" \/>Les co\u00fbts varient selon la taille du locataire et la complexit\u00e9 des donn\u00e9es.<br data-start=\"3509\" data-end=\"3512\" \/>Les petites entreprises montr\u00e9alaises pr\u00e9voient g\u00e9n\u00e9ralement entre <strong data-start=\"3579\" data-end=\"3602\">3 000 $ et 10 000 $<\/strong> pour une migration compl\u00e8te, tandis que les projets hybrides ou multi-locataires peuvent co\u00fbter davantage.<\/p>\n<p data-start=\"3711\" data-end=\"3963\"><strong data-start=\"3711\" data-end=\"3747\">Combien de temps cela prend-il ?<\/strong><br data-start=\"3747\" data-end=\"3750\" \/>Une migration simple peut \u00eatre compl\u00e9t\u00e9e en un week-end, mais la phase de d\u00e9couverte et les v\u00e9rifications pr\u00e9alables exigent <strong data-start=\"3875\" data-end=\"3893\">2 \u00e0 4 semaines<\/strong>.<br data-start=\"3894\" data-end=\"3897\" \/>Les consolidations complexes peuvent s\u2019\u00e9tendre sur plusieurs mois.<\/p>\n<p data-start=\"3965\" data-end=\"4244\"><strong data-start=\"3965\" data-end=\"4014\">Les employ\u00e9s ont-ils besoin d\u2019une formation ?<\/strong><br data-start=\"4014\" data-end=\"4017\" \/>Oui. M\u00eame s\u2019ils utilisent d\u00e9j\u00e0 Outlook et Teams, chaque migration modifie les m\u00e9thodes de connexion, le MFA et les chemins d\u2019acc\u00e8s aux fichiers.<br data-start=\"4161\" data-end=\"4164\" \/>Une courte formation peut <strong data-start=\"4190\" data-end=\"4209\">r\u00e9duire de 40 %<\/strong> les appels au soutien technique.<\/p>\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>De nombreuses entreprises montr\u00e9alaises ont d\u00e9j\u00e0 v\u00e9cu ce cauchemar : tout est planifi\u00e9 pour une coupure le vendredi soir afin de migrer vers Microsoft 365, mais le lundi matin, les employ\u00e9s ne peuvent toujours pas se connecter, les courriels sont retard\u00e9s, ou les r\u00e9unions Teams ont disparu.Le vrai probl\u00e8me ? Ce n\u2019est g\u00e9n\u00e9ralement pas l\u2019outil [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6046,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[52],"tags":[],"class_list":["post-6098","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-microsoft-365"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Les \u00e9tapes cach\u00e9es d\u2019une migration Microsoft 365 qui retardent la mise en production - AET Solutions USA<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dev.aetsolutions.ca\/fr\/les-etapes-cachees-dune-migration-microsoft-365-qui-retardent-la-mise-en-production\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les \u00e9tapes cach\u00e9es d\u2019une migration Microsoft 365 qui retardent la mise en production - AET Solutions USA\" \/>\n<meta property=\"og:description\" content=\"De nombreuses entreprises montr\u00e9alaises ont d\u00e9j\u00e0 v\u00e9cu ce cauchemar : tout est planifi\u00e9 pour une coupure le vendredi soir afin de migrer vers Microsoft 365, mais le lundi matin, les employ\u00e9s ne peuvent toujours pas se connecter, les courriels sont retard\u00e9s, ou les r\u00e9unions Teams ont disparu.Le vrai probl\u00e8me ? 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