{"id":28991,"date":"2026-08-15T14:28:07","date_gmt":"2026-08-15T14:28:07","guid":{"rendered":"https:\/\/www.assistencia-informatica.pt\/?p=28991"},"modified":"2026-08-15T15:18:52","modified_gmt":"2026-08-15T15:18:52","slug":"licences-de-securite-microsoft-365-pme","status":"publish","type":"post","link":"https:\/\/www.assistencia-informatica.pt\/fr\/servicos-it\/microsoft-365-pme-licencas-seguranca\/","title":{"rendered":"Microsoft 365 pour PME : Licences, S\u00e9curit\u00e9 et le Mythe de la Sauvegarde"},"content":{"rendered":"<p><!-- dr-visual --><\/p>\n<p class=\"dr-meta\">3 min de lecture DataRoad<\/p>\n<div class=\"dr-resumo\">\n<p class=\"dr-t\">En r\u00e9sum\u00e9<\/p>\n<ul>\n<li><strong>Microsoft 365 ne fait pas de sauvegarde de vos donn\u00e9es<\/strong> de la mani\u00e8re que la plupart des entreprises supposent. La responsabilit\u00e9 des donn\u00e9es incombe au client.<\/li>\n<li><strong>La plupart des entreprises paient des licences en trop<\/strong> \u2014 pour des plans surdimensionn\u00e9s et pour des comptes de ceux qui sont d\u00e9j\u00e0 partis.<\/li>\n<li>A <strong>authentification \u00e0 deux facteurs<\/strong> c'est la mesure isol\u00e9e qui r\u00e9duit le plus le risque, et elle reste d\u00e9sactiv\u00e9e dans de nombreux abonnements.<\/li>\n<li>Migrer les e-mails est facile ; <strong>migrer les fichiers et les habitudes<\/strong> c'est que \u00e7a demande du travail.<\/li>\n<\/ul>\n<\/div>\n<div class=\"dr-toc\">\n<p class=\"dr-t\">Dans cet article<\/p>\n<ol>\n<li><a href=\"#s-planos\">Choisir le forfait sans payer en plus<\/a><\/li>\n<li><a href=\"#s-backup\">Le malentendu des copies de sauvegarde<\/a><\/li>\n<li><a href=\"#s-seguranca\">S\u00e9curit\u00e9 minimale<\/a><\/li>\n<li><a href=\"#s-ficheiros\">Dossiers : l\u00e0 o\u00f9 les migrations tournent mal<\/a><\/li>\n<li><a href=\"#s-gestao\">Gestion courante<\/a><\/li>\n<\/ol>\n<\/div>\n<p>Microsoft 365 est aujourd'hui la base de travail de la plupart des entreprises portugaises. Pr\u00e9cis\u00e9ment parce qu'il est si courant, c'est aussi l\u00e0 que s'accumulent les erreurs les plus co\u00fbteuses \u2014 presque toujours sur trois fronts : des licences en trop, une s\u00e9curit\u00e9 \u00e0 configurer et la fausse id\u00e9e que les donn\u00e9es sont automatiquement prot\u00e9g\u00e9es.<\/p>\n<h2 id=\"s-planos\">Choisir le forfait sans payer en plus<\/h2>\n<p>L'erreur la plus fr\u00e9quente est d'attribuer le m\u00eame plan \u00e0 tout le monde. Dans une entreprise, les profils d'utilisation sont tr\u00e8s diff\u00e9rents : celui qui passe la journ\u00e9e sur des feuilles de calcul et des pr\u00e9sentations n'a pas les m\u00eames besoins que celui qui a seulement besoin d'un e-mail et d'un endroit pour stocker des fichiers.<\/p>\n<p>Avant de renouveler, il vaut la peine de r\u00e9pondre \u00e0 trois questions par personne : avez-vous besoin des applications install\u00e9es sur l'ordinateur ou la version sur le navigateur suffit-elle ? Avez-vous besoin de plus d'espace que le forfait de base ? Avez-vous besoin de fonctionnalit\u00e9s avanc\u00e9es de s\u00e9curit\u00e9 et de conformit\u00e9 ?<\/p>\n<p>Dans la plupart des entreprises, un examen honn\u00eate trouve un nombre pertinent de licences qui peuvent descendre de niveau \u2014 et tout autant qui ne devraient tout simplement plus exister.<\/p>\n<div class=\"dr-destaque\">\n<p><strong>Comptes de ceux qui sont d\u00e9j\u00e0 partis.<\/strong> C'est le gaspillage le plus courant et le plus facile \u00e0 corriger. Le compte d'un collaborateur parti il y a un an continue d'\u00eatre factur\u00e9 tous les mois et, pire encore, reste une porte d'entr\u00e9e. Une r\u00e9vision trimestrielle r\u00e8gle ces deux probl\u00e8mes.<\/p>\n<\/div>\n<figure class=\"dr-imagem\" style=\"margin:34px auto;max-width:660px;\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.assistencia-informatica.pt\/wp-content\/uploads\/2026\/04\/Office_365_Montage_v2-768x600.webp\" alt=\"Montage Office 365 V2\" width=\"768\" height=\"600\" style=\"display:block;width:100%;height:auto;border-radius:6px;\" \/><figcaption style=\"font-size:13.5px;line-height:1.5;color:#8a8a8a;margin-top:10px;\">La bonne licence d\u00e9pend de ce que l'entreprise utilise r\u00e9ellement \u2014 et les param\u00e8tres de s\u00e9curit\u00e9 ne sont pas activ\u00e9s par d\u00e9faut.<\/figcaption><\/figure>\n<h2 id=\"s-backup\">Le malentendu des copies de sauvegarde<\/h2>\n<p>C'est la confusion la plus dangereuse, et cela vaut la peine d'\u00eatre tr\u00e8s clair \u00e0 ce sujet.<\/p>\n<p>Microsoft garantit une <strong>disponibilit\u00e9 du service<\/strong> \u2014 que la plateforme fonctionne et que vous ne perdez pas vos donn\u00e9es en raison d'une panne d'infrastructure. Ce n'est pas la m\u00eame chose que de faire une sauvegarde de vos donn\u00e9es contre vos propres erreurs.<\/p>\n<p>Si quelqu'un supprime un dossier partag\u00e9 et que personne ne s'en aper\u00e7oit pendant des mois, si un compte est compromis et le contenu supprim\u00e9, ou si un ransomware chiffre des fichiers synchronis\u00e9s, les m\u00e9canismes de r\u00e9tention natifs ont des d\u00e9lais limit\u00e9s. Pass\u00e9s ces d\u00e9lais, le contenu ne revient pas.<\/p>\n<p>Une entreprise qui d\u00e9pend de Microsoft 365 pour les e-mails et les documents a besoin d'une <a href=\"\/fr\/sauvegardes-solutions-de-sauvegarde\/\">solution de sauvegarde d\u00e9di\u00e9e<\/a>, avec une r\u00e9tention d\u00e9finie par vous et une restauration test\u00e9e. C'est un petit co\u00fbt au regard de ce qu'il prot\u00e8ge.<\/p>\n<h2 id=\"s-seguranca\">S\u00e9curit\u00e9 minimale<\/h2>\n<p>Il y a un ensemble de mesures qui devrait \u00eatre actif dans n'importe quel abonnement d'entreprise et qui, en pratique, est d\u00e9sactiv\u00e9 avec une fr\u00e9quence d\u00e9concertante :<\/p>\n<ul>\n<li><strong>Authentification \u00e0 deux facteurs pour tous<\/strong> \u2014 pas d'exceptions pour la direction, qui est pr\u00e9cis\u00e9ment celle qui est le plus vis\u00e9e.<\/li>\n<li><strong>Blocage des anciens protocoles d'authentification<\/strong>, qui permettent de contourner le second facteur.<\/li>\n<li><strong>Alertes de transfert automatique d'e-mails<\/strong> \u2014 cr\u00e9er une r\u00e8gle qui r\u00e9achemine tout vers l'ext\u00e9rieur est la premi\u00e8re \u00e9tape classique de quelqu'un qui compromet un compte.<\/li>\n<li><strong>R\u00e9vision des partages externes<\/strong> \u2014 fichiers partag\u00e9s par lien avec tout le monde, cr\u00e9\u00e9s il y a deux ans et jamais r\u00e9examin\u00e9s.<\/li>\n<li><strong>Journal d'audit actif<\/strong>, car apr\u00e8s un incident, c'est la seule fa\u00e7on de comprendre ce qui s'est pass\u00e9.<\/li>\n<\/ul>\n<h2 id=\"s-ficheiros\">Dossiers : l\u00e0 o\u00f9 les migrations tournent mal<\/h2>\n<p>Migrer des e-mails est aujourd'hui un processus tout \u00e0 fait pr\u00e9visible. Ce qui a tendance \u00e0 mal tourner, c'est la partie des fichiers \u2014 et la raison est rarement technique.<\/p>\n<p>Le probl\u00e8me est de d\u00e9cider <strong>O\u00f9 vit chaque chose<\/strong>. Les documents personnels de travail, les documents d'\u00e9quipe et les documents de l'entreprise ont des emplacements diff\u00e9rents, et les m\u00e9langer cr\u00e9e une confusion qui dure des ann\u00e9es. Lorsqu'un document important est stock\u00e9 dans l'espace personnel de quelqu'un, il quitte l'entreprise lorsque cette personne part.<\/p>\n<p>Il vaut la peine de d\u00e9finir trois r\u00e8gles avant de d\u00e9placer le premier fichier : ce qui appartient \u00e0 l'\u00e9quipe vit dans des espaces d'\u00e9quipe ; les permissions se d\u00e9finissent par groupe et non par personne ; et les structures de dossiers h\u00e9rit\u00e9es d'un ancien serveur doivent \u00eatre simplifi\u00e9es lors de la migration, et non r\u00e9pliqu\u00e9es.<\/p>\n<p>Et compter sur un temps d'adaptation. La technologie migre en un week-end ; les habitudes prennent des semaines.<\/p>\n<h2 id=\"s-gestao\">Gestion courante<\/h2>\n<p>Microsoft 365 n'est pas un produit que l'on installe et que l'on oublie. Il change fr\u00e9quemment, et un abonnement sans maintenance se d\u00e9grade en silence.<\/p>\n<p>Quatre routines simples gardent les choses en ordre : r\u00e9vision trimestrielle des licences et des comptes actifs ; v\u00e9rification p\u00e9riodique des partages externes ; test r\u00e9el de restauration de la sauvegarde au moins une fois par an ; et r\u00e9vision des acc\u00e8s chaque fois que quelqu'un entre ou sort.<\/p>\n<p>Aucune de celles-ci n'exige de connaissances approfondies. Elles exigent seulement que quelqu'un ait la responsabilit\u00e9 attribu\u00e9e \u2014 et c'est l\u00e0 que cela \u00e9choue g\u00e9n\u00e9ralement.<\/p>\n<p>DataRoad met en \u0153uvre et g\u00e8re <a href=\"\/fr\/nuage-office-365\/\">Microsoft 365 et solutions cloud pour les entreprises<\/a>, y compris la migration, la configuration de s\u00e9curit\u00e9 et les sauvegardes d\u00e9di\u00e9es, dans les <a href=\"\/fr\/services-informatiques-pour-les-entreprises\/\">services informatiques g\u00e9r\u00e9s<\/a>.<\/p>\n<div class=\"dr-contacto\">\n<p class=\"dr-t\">Une discussion avant de prendre une d\u00e9cision<\/p>\n<p class=\"dr-d\">Que vous cherchiez \u00e0 r\u00e9soudre un probl\u00e8me concret, que vous envisagiez un changement ou que vous souhaitiez simplement obtenir un deuxi\u00e8me avis, nous proc\u00e9dons toujours de la m\u00eame mani\u00e8re : nous commen\u00e7ons par comprendre votre situation avant de vous proposer quoi que ce soit. Sans engagement, sans jargon et sans catalogues.<\/p>\n<div class=\"dr-vias\"><a href=\"tel:+351211459950\"><span class=\"dr-l\">T\u00e9l\u00e9phone<\/span><span class=\"dr-v\">351 211 459 950<\/span><span class=\"dr-n\">appel vers le r\u00e9seau fixe national<\/span><\/a><a href=\"mailto:sales@dataroad.pt\"><span class=\"dr-l\">Courriel<\/span><span class=\"dr-v\">sales@dataroad.pt<\/span><span class=\"dr-n\">D\u00e9crivez-nous votre situation<\/span><\/a><\/div>\n<p class=\"dr-acao\"><a href=\"https:\/\/www.assistencia-informatica.pt\/fr\/entreprise-de-services-informatiques-2\/\">Planifier un audit de votre infrastructure<\/a><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Microsoft 365 pour les entreprises : comment \u00e9viter de payer des licences en trop, pourquoi Microsoft ne sauvegarde pas vos donn\u00e9es, la s\u00e9curit\u00e9 minimale \u00e0 activer et l\u00e0 o\u00f9 les migrations tournent mal.<\/p>","protected":false},"author":1,"featured_media":29077,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"rs_blank_template":"","rs_page_bg_color":"","slide_template_v7":"","footnotes":""},"categories":[1],"tags":[139],"class_list":["post-28991","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-servicos-it","tag-blog"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 5.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Microsoft 365 para PME: que licen\u00e7as escolher, como refor\u00e7ar a seguran\u00e7a e porque o backup do 365 \u00e9 um mito que pode sair caro.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Webmaster\"\/>\n\t<meta name=\"msvalidate.01\" content=\"AAA868BD701CDD0DD556284F90EC5D5C\" \/>\n\t<link rel=\"canonical\" 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