{"id":241,"date":"2026-06-11T09:56:23","date_gmt":"2026-06-11T08:56:23","guid":{"rendered":"https:\/\/timbertops.co.uk\/?p=241"},"modified":"2026-06-12T10:07:00","modified_gmt":"2026-06-12T09:07:00","slug":"outlook-classic-disable-m365-autodiscover-override","status":"publish","type":"post","link":"https:\/\/timbertops.co.uk\/index.php\/2026\/06\/11\/outlook-classic-disable-m365-autodiscover-override\/","title":{"rendered":"Outlook (classic) disable M365 autodiscover override"},"content":{"rendered":"<p>Outlook 2019 onwards seems to have a problem where it will aggressively default to using Microsoft 365 for all exchange servers even 3rd party one these reg keys seem to disable that behaviour.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">Windows Registry Editor Version 5.00\r\n\r\n[HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\16.0\\Outlook\\AutoDiscover]\r\n\"ExcludeExplicitO365Endpoint\"=dword:00000001\r\n\"ExcludeHttpsRootDomain\"=dword:00000001\r\n\"DisableOffice365SimplifiedAccountCreation\"=dword:00000001\r\n<\/pre>\n<p>The beast way to apply these on a non admin\/standard user account is to create a text file, add these keys then save the file as &lt;filename&gt;.reg then you can run and add these keys without a UAC admin login<\/p>\n<p>&nbsp;<\/p>\n<p>A couple of notes:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">\"ExcludeSrvRecord\"=dword:00000000<\/pre>\n<p>The ExcludeSrvRecord key needs to not be set or set to 0 i.e. NOT Disabled. or the Autodiscovery will not get the setting from the SRV record<\/p>\n<p>&nbsp;<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">\"ExcludeScpLookup\"=dword:00000001\r\n\r\n<\/pre>\n<p>Might not be needed as this tries to get the settings from a server on the local domain<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Outlook 2019 onwards seems to have a problem where it will aggressively default to using Microsoft 365 for all exchange servers even 3rd party one these reg keys seem to disable that behaviour. Windows Registry Editor Version 5.00 [HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\16.0\\Outlook\\AutoDiscover] &#8220;ExcludeExplicitO365Endpoint&#8221;=dword:00000001 &#8220;ExcludeHttpsRootDomain&#8221;=dword:00000001 &#8220;DisableOffice365SimplifiedAccountCreation&#8221;=dword:00000001 The beast way to apply these on a non admin\/standard user account is &hellip; <a href=\"https:\/\/timbertops.co.uk\/index.php\/2026\/06\/11\/outlook-classic-disable-m365-autodiscover-override\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Outlook (classic) disable M365 autodiscover override&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-241","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/timbertops.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/241","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/timbertops.co.uk\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/timbertops.co.uk\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/timbertops.co.uk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/timbertops.co.uk\/index.php\/wp-json\/wp\/v2\/comments?post=241"}],"version-history":[{"count":5,"href":"https:\/\/timbertops.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/241\/revisions"}],"predecessor-version":[{"id":246,"href":"https:\/\/timbertops.co.uk\/index.php\/wp-json\/wp\/v2\/posts\/241\/revisions\/246"}],"wp:attachment":[{"href":"https:\/\/timbertops.co.uk\/index.php\/wp-json\/wp\/v2\/media?parent=241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/timbertops.co.uk\/index.php\/wp-json\/wp\/v2\/categories?post=241"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/timbertops.co.uk\/index.php\/wp-json\/wp\/v2\/tags?post=241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}