{"id":1683,"date":"2023-04-21T09:45:00","date_gmt":"2023-04-21T09:45:00","guid":{"rendered":"http:\/\/neu.koetzingit.de\/office-365-outlook-als-standard-e-mail-client-nicht-verfuegbar\/"},"modified":"2026-06-02T13:32:28","modified_gmt":"2026-06-02T13:32:28","slug":"office-365-outlook-als-standard-e-mail-client-nicht-verfuegbar","status":"publish","type":"post","link":"https:\/\/www.koetzingit.de\/en\/office-365-outlook-als-standard-e-mail-client-nicht-verfuegbar\/","title":{"rendered":"Office 365: Outlook is not available as the default email client"},"content":{"rendered":"<p><span class=\"dropcapmiddle\">M<\/span>In Office 365, Outlook isn't set as the default email client. What sounds like a simple problem turns into a long search, with a <strong>the surprising twist at the end<\/strong>. The issue is caused by Adobe Acrobat Reader and the feature that allows you to send PDFs via the default email client. Using this feature results in an error stating that no default email client is available. The default client is set under <code>HKLM\\SOFTWARE\\Clients\\Mail<\/code> specified, but precisely this <b>The entry disappears after closing Outlook!<\/b><\/p>\n<p><!--more--><\/p>\n<p>The first question is whether Outlook is actually responsible, which is why we're using the Procmon program. This reveals the true culprit, which is the process <strong>OfficeClickToRun.exe<\/strong>! What exactly this process is for isn't entirely clear. Installing and updating Office often leads to an \"etc.,\" but what exactly is this \"etc.\"? Well, it's due to an Office component, and as is often the case, it might be related to permissions or policies\u2014though that was quickly ruled out. However, when testing on the master target, the problem doesn\u2019t occur, leading to the classic question: what\u2019s different? With this information, it could still be a component\u2014specifically, the FSLogix rules for Microsoft Office\u2014and that turned out to be the exact cause. Although the permissions for the users were correct, the System user was missing\u2014and it is precisely under this user that the Microsoft Office Click-to-Run service runs. Add the System user, and the problem is fixed. This allowed the service to access the user\u2019s license.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1682\" title=\"FSLogix Rules\" src=\"http:\/\/www.koetzingit.de\/wp-content\/uploads\/2023\/04\/news-fslogixs-rules.png\" alt=\"FSLogix Rules\" width=\"550\" height=\"414\" srcset=\"https:\/\/www.koetzingit.de\/wp-content\/uploads\/2023\/04\/news-fslogixs-rules.png 550w, https:\/\/www.koetzingit.de\/wp-content\/uploads\/2023\/04\/news-fslogixs-rules-300x226.png 300w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><\/p>\n<p>But the question is, why does the Office Click-to-Run service remove Outlook as the default email client? If Outlook or all Office programs were to stop working because the service can\u2019t access the license, that would be understandable, but why remove only the default email client? That\u2019s a mystery that only Microsoft could clarify.<\/p>\n<div id=\"___gcse_0\">\n<div class=\"gsc-control-cse gsc-control-cse-de\">\n<div class=\"gsc-control-wrapper-cse\" dir=\"ltr\">\n<div class=\"gsc-results-wrapper-nooverlay gsc-results-wrapper-visible\">\n<div class=\"gsc-positioningWrapper\">\u00a0<\/div>\n<div class=\"gsc-positioningWrapper\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>\u00a0<\/p>","protected":false},"excerpt":{"rendered":"<p>Mit Office 365 wird Outlook nicht als Standard-E-Mail-Client gesetzt. Was sich nach einem einfachen Problem anh\u00f6rt, wird zu einer langen [&hellip;]<\/p>\n","protected":false},"author":1755,"featured_media":1681,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[23],"tags":[287,290,250,32,283,289,288,194,291,154],"class_list":["post-1683","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-microsoft-de","tag-client","tag-email","tag-fslogix","tag-microsoft","tag-office-365","tag-officeclicktorun","tag-outlook","tag-procmon","tag-regeln","tag-standard"],"uagb_featured_image_src":{"full":["https:\/\/www.koetzingit.de\/wp-content\/uploads\/2023\/04\/news-office365.jpg",360,360,false],"thumbnail":["https:\/\/www.koetzingit.de\/wp-content\/uploads\/2023\/04\/news-office365-150x150.jpg",150,150,true],"medium":["https:\/\/www.koetzingit.de\/wp-content\/uploads\/2023\/04\/news-office365-300x300.jpg",300,300,true],"medium_large":["https:\/\/www.koetzingit.de\/wp-content\/uploads\/2023\/04\/news-office365.jpg",360,360,false],"large":["https:\/\/www.koetzingit.de\/wp-content\/uploads\/2023\/04\/news-office365.jpg",360,360,false],"1536x1536":["https:\/\/www.koetzingit.de\/wp-content\/uploads\/2023\/04\/news-office365.jpg",360,360,false],"2048x2048":["https:\/\/www.koetzingit.de\/wp-content\/uploads\/2023\/04\/news-office365.jpg",360,360,false],"trp-custom-language-flag":["https:\/\/www.koetzingit.de\/wp-content\/uploads\/2023\/04\/news-office365.jpg",12,12,false]},"uagb_author_info":{"display_name":"Thomas K\u00f6tzing","author_link":"https:\/\/www.koetzingit.de\/en\/author\/thomas-koetzing\/"},"uagb_comment_info":0,"uagb_excerpt":"Mit Office 365 wird Outlook nicht als Standard-E-Mail-Client gesetzt. Was sich nach einem einfachen Problem anh\u00f6rt, wird zu einer langen [&hellip;]","_links":{"self":[{"href":"https:\/\/www.koetzingit.de\/en\/wp-json\/wp\/v2\/posts\/1683","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.koetzingit.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.koetzingit.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.koetzingit.de\/en\/wp-json\/wp\/v2\/users\/1755"}],"replies":[{"embeddable":true,"href":"https:\/\/www.koetzingit.de\/en\/wp-json\/wp\/v2\/comments?post=1683"}],"version-history":[{"count":1,"href":"https:\/\/www.koetzingit.de\/en\/wp-json\/wp\/v2\/posts\/1683\/revisions"}],"predecessor-version":[{"id":1860,"href":"https:\/\/www.koetzingit.de\/en\/wp-json\/wp\/v2\/posts\/1683\/revisions\/1860"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.koetzingit.de\/en\/wp-json\/wp\/v2\/media\/1681"}],"wp:attachment":[{"href":"https:\/\/www.koetzingit.de\/en\/wp-json\/wp\/v2\/media?parent=1683"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.koetzingit.de\/en\/wp-json\/wp\/v2\/categories?post=1683"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.koetzingit.de\/en\/wp-json\/wp\/v2\/tags?post=1683"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}