{"id":4011,"date":"2026-06-08T18:05:10","date_gmt":"2026-06-08T15:05:10","guid":{"rendered":"https:\/\/support.withsecure.com\/en\/?post_type=support_article&#038;p=4011"},"modified":"2026-06-08T18:05:10","modified_gmt":"2026-06-08T15:05:10","slug":"windows-defender-is-uninstalled-after-installing-withsecure-server-security-15-10-on-windows-server-2016","status":"publish","type":"support_article","link":"https:\/\/support.withsecure.com\/fi\/support-articles\/windows-defender-is-uninstalled-after-installing-withsecure-server-security-15-10-on-windows-server-2016\/","title":{"rendered":"Windows Defender is uninstalled after installing WithSecure Server Security 15.10 on Windows Server 2016"},"content":{"rendered":"<h3>Issue:<\/h3>\n<p>Windows Defender was uninstalled after installing WithSecure Server Security 15.10 on Windows Server 2016.<br \/>On ESS manual (SS should be the same as well) describes below.<br \/>===<br \/>After installing the product on Windows Server 2016 or newer, you need to explicitly disable or uninstall Windows Defender.<br \/>===<br \/>https:\/\/help.f-secure.com\/product.html#business\/email-server-security\/15.00\/en\/task_423BA82B96694FA2A64F7EDE3787C225-15.00-en<\/p>\n<p>Does this mean that Windows Defender is not automatically uninstalled even though &quot;Switch off Windows Defender during installation&quot; is enabled?<br \/>Is this expected behavior?<br \/>There are other servers which Windows Defender was not uninstalled but it was just disabled. What is the difference?<\/p>\n<h3>Resolution:<\/h3>\n<p>Actually Server Security uninstalls Windows Defender from the server.<br \/>But it will be enabled back upon our product uninstallation.<\/p>\n<p>In case, it&#39;s necessary for Windows Defender to get back without uninstalling our product, they can run this command in powershell with admin rights.<\/p>\n<pre class=\"ckeditor_codeblock\">\npowershell Install-WindowsFeature -Name Windows-Defender<\/pre>\n<p>We don&#39;t actually log the output of Windows Defender disabling attempts &#8211; there could be different reasons why Windows Defender can&#39;t be uninstalled in some cases, e.g., GPO settings on the server.<\/p>\n<p>Customer can, for example, try the command<\/p>\n<pre class=\"ckeditor_codeblock\">\npowershell Uninstall-WindowsFeature -Name Windows-Defender<\/pre>\n<p>by themselves on the affected server, and see if it works.<br \/>\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Windows Defender was uninstalled after installing F-Secure Server Security 15.10 on Windows Server 2016.<br \/>\nOn ESS manual (SS should be the same as well) describes below.<br \/>\n===<br \/>\nAfter installing the product on Windows Server 2016 or newer, you need to explicitly disable or uninstall Windows Defender.<br \/>\n===<br \/>\nhttps:\/\/help.f-secure.com\/product.html#business\/email-server-security\/15.00\/en\/task_423BA82B96694FA2A64F7EDE3787C225-15.00-en<\/p>\n<p>Does this mean that Windows Defender is not automatically uninstalled eve<\/p>\n","protected":false},"template":"","support_article_product":[106],"class_list":["post-4011","support_article","type-support_article","status-publish","hentry"],"acf":{"source_foreign_id":"000005622","source_version":3,"source_system":"salesforce","source_date_updated":"2026-06-08 15:05:10","import_hash":"7059313638de8fd9719400712c36d004f9df73d6","vanilla_article_id":32682,"vanilla_url":"https:\/\/community.withsecure.com\/en\/kb\/articles\/32682-windows-defender-is-uninstalled-after-installing-withsecure-server-security-15-10-on-windows-server-2016","vanilla_kb_id":30,"vanilla_category_id":103,"machine_translated":false,"reactions_helpful_yes":0,"reactions_helpful_no":0},"_links":{"self":[{"href":"https:\/\/support.withsecure.com\/fi\/wp-json\/wp\/v2\/support_article\/4011","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/support.withsecure.com\/fi\/wp-json\/wp\/v2\/support_article"}],"about":[{"href":"https:\/\/support.withsecure.com\/fi\/wp-json\/wp\/v2\/types\/support_article"}],"wp:attachment":[{"href":"https:\/\/support.withsecure.com\/fi\/wp-json\/wp\/v2\/media?parent=4011"}],"wp:term":[{"taxonomy":"support_article_product","embeddable":true,"href":"https:\/\/support.withsecure.com\/fi\/wp-json\/wp\/v2\/support_article_product?post=4011"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}