{"id":15833,"date":"2026-04-09T08:01:13","date_gmt":"2026-04-08T23:01:13","guid":{"rendered":"https:\/\/m365jp.net\/?p=15833"},"modified":"2026-04-09T08:06:26","modified_gmt":"2026-04-08T23:06:26","slug":"mc1154300-new-pdf-viewer-enabled-by-default-in-microsoft-edge-starting-october-2025-2","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-04-09-mc1154300-new-pdf-viewer-enabled-by-default-in-microsoft-edge-starting-october-2025-2","title":{"rendered":"MC1154300 | New PDF Viewer Enabled by Default in Microsoft Edge Starting October 2025"},"content":{"rendered":"<div class=\"postie-post\">\n<div>\n<hr>\n<table id=\"section\">\n<tbody>\n<tr>\n<th width=\"95%\">MC1154300 | New PDF Viewer Enabled by Default in Microsoft Edge Starting October 2025<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr>\n<table id=\"data\">\n<tbody>\n<tr>\n<th>Classification<\/th>\n<td>planForChange<\/td>\n<\/tr>\n<tr>\n<th>Last Updated<\/th>\n<td>04\/08\/2026 22:56:43<\/td>\n<\/tr>\n<tr>\n<th>Start Time<\/th>\n<td>09\/16\/2025 22:23:46<\/td>\n<\/tr>\n<tr>\n<th>End Time<\/th>\n<td>05\/29\/2026 07:00:00<\/td>\n<\/tr>\n<tr>\n<th>Message Content<\/th>\n<td><b>[Introduction]<\/b>  <\/p>\n<p>Starting in October 2025, Microsoft Edge version 141 will introduce the Adobe-powered PDF viewer as the default experience for enterprise users on Windows. This change enhances performance, accessibility, and compatibility, and introduces exclusive enterprise   features. It follows our earlier <a href=\"https:\/\/blogs.windows.com\/msedgedev\/2023\/02\/08\/adobe-acrobat-microsoft-edge-pdf\/\">  public announcement<\/a> and aligns with Roadmap ID&nbsp;<a href=\"https:\/\/www.microsoft.com\/microsoft-365\/roadmap?filters=&amp;searchterms=489231\">489231<\/a> and MC post MC1072406.&lt;!&#8211; happen:]  <\/p>\n<p><b>General Availability:<\/b>&nbsp;Migration will occur on a phased rollout. Rollout will begin October 2025 and will complete March 2026.&nbsp;<\/p>\n<p>  <b>[How this affects your organization:]<\/b>  <\/p>\n<p><b>Who is affected:<\/b><\/p>\n<p>  <\/p>\n<ul>  <\/p>\n<li>All enterprise users on Windows using Microsoft Edge.<\/li>\n<p>  <\/ul>\n<p>  <\/p>\n<p><b>What will happen:<\/b><\/p>\n<p>  <\/p>\n<ul>  <\/p>\n<li>The Adobe-powered PDF viewer will replace the legacy viewer as the default experience.<\/li>\n<p>  <\/p>\n<li>User interface and controls will remain unchanged.<\/li>\n<p>  <\/p>\n<li>The new viewer offers improved performance, accessibility, compatibility, and exclusive enterprise features.<\/li>\n<p>  <\/ul>\n<p>Admins can manage the experience using two policies:<\/p>\n<p><a href=\"https:\/\/learn.microsoft.com\/deployedge\/microsoft-edge-browser-policies\/newpdfreaderenabled\" target=\"_blank\">NewPDFReaderEnabled<\/a>: Controls the default viewer in Edge for Windows.&nbsp;<\/p>\n<p><a href=\"https:\/\/learn.microsoft.com\/deployedge\/microsoft-edge-webview-policies#newpdfreaderwebview2list\" target=\"_blank\">NewPDFReaderWebView2List<\/a>: Controls viewer behavior in WebView2 apps.&nbsp;<\/p>\n<p>  <\/p>\n<ul>  <\/ul>\n<p><b>Policy behavior:<\/b><\/p>\n<p>  <\/p>\n<table border=\"1\">  <\/p>\n<tbody>\n<tr>\n<th>Policy State<\/th>\n<th>Before Enablement by Default<\/th>\n<th>After Enablement by Default<\/th>\n<\/tr>\n<p>  <\/p>\n<tr>\n<td>Default<\/td>\n<td>Old PDF Viewer<\/td>\n<td>New PDF Viewer<\/td>\n<\/tr>\n<p>  <\/p>\n<tr>\n<td>Enabled<\/td>\n<td>New PDF Viewer<\/td>\n<td>New PDF Viewer<\/td>\n<\/tr>\n<p>  <\/p>\n<tr>\n<td>Disabled<\/td>\n<td>Old PDF Viewer<\/td>\n<td>Old PDF Viewer<\/td>\n<\/tr>\n<p>  <\/tbody>\n<\/table>\n<p>  <b>[What you can do to prepare:]<\/b>  <\/p>\n<ul>  <\/ul>\n<\/p>\n<p>No action is required if your organization is ready to adopt the new viewer.  <\/p>\n<p>If you wish to manage the experience:<\/p>\n<ul>\n<li>Enable the new viewer early using the <a href=\"https:\/\/learn.microsoft.com\/deployedge\/microsoft-edge-browser-policies\/newpdfreaderenabled\" target=\"_blank\">  NewPDFReaderEnabled<\/a> policy.<\/li>\n<li>Opt-out by disabling the same policy. Opt-out will be supported until June 2026, at which time the policy will be deprecated and any remaining organizations will be moved to the new viewer.&nbsp;<\/li>\n<li>Review and update internal documentation if needed.<\/li>\n<li>Communicate this change to helpdesk or support teams.<\/li>\n<\/ul>\n<ul>  <\/ul>\n<\/p>\n<p>Learn more:&nbsp;<a href=\"https:\/\/techcommunity.microsoft.com\/blog\/microsoftedgeinsider\/microsoft-edge-and-adobe-partner-to-improve-the-pdf-experience\/3733481\" target=\"_blank\" style=\"font-family: sans-serif;font-weight: 400\">Microsoft   Edge and Adobe partner to improve the PDF experience<\/a>.<\/p>\n<p>For support, contact your Microsoft CSAM or CSS representative.<\/p>\n<div><b>[Compliance considerations:]<\/b><\/div>\n<div>No compliance considerations identified, review as appropriate for your organization.<\/div>\n<\/td>\n<\/tr>\n<tr>\n<th>Machine Translation<\/th>\n<td><b>[\u306f\u3058\u3081\u306b]<\/b>  <\/p>\n<p>2025\u5e7410\u6708\u304b\u3089\u3001Microsoft Edge\u30d0\u30fc\u30b8\u30e7\u30f3141\u306fWindows\u306e\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u30e6\u30fc\u30b6\u30fc\u5411\u3051\u306bAdobe\u642d\u8f09\u306ePDF\u30d3\u30e5\u30fc\u30a2\u3092\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u4f53\u9a13\u3068\u3057\u3066\u5c0e\u5165\u3057\u307e\u3059\u3002\u3053\u306e\u5909\u66f4\u306b\u3088\u308a\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3001\u30a2\u30af\u30bb\u30b9\u306e\u3057\u3084\u3059\u3055\u3001\u4e92\u63db\u6027\u304c\u5411\u4e0a\u3057\u3001\u72ec\u81ea\u306e\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u6a5f\u80fd\u304c\u5c0e\u5165\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u4ee5\u524d\u306e  <a href=\"https:\/\/blogs.windows.com\/msedgedev\/2023\/02\/08\/adobe-acrobat-microsoft-edge-pdf\/\">  \u516c\u8868<\/a> \u306b\u7d9a\u304d\u3001\u30ed\u30fc\u30c9\u30de\u30c3\u30d7ID(ID)&nbsp;<a href=\"https:\/\/www.microsoft.com\/microsoft-365\/roadmap?filters=&amp;searchterms=489231\">489231<\/a> \u304a\u3088\u3073MC\u306e\u30dd\u30b9\u30c8MC1072406\u3068\u4e00\u81f4\u3057\u3066\u3044\u307e\u3059\u3002&lt;!&#8211; happen:]  <\/p>\n<p><b>\u4e00\u822c\u63d0\u4f9b<\/b>&nbsp;:\u79fb\u884c\u306f\u6bb5\u968e\u7684\u306b\u5c55\u958b\u3055\u308c\u307e\u3059\u3002\u5c55\u958b\u306f2025\u5e7410\u6708\u306b\u59cb\u307e\u308a\u30012026\u5e743\u6708\u306b\u5b8c\u4e86\u3057\u307e\u3059\u3002&nbsp;<\/p>\n<p>  <b>[\u3053\u308c\u304c\u3042\u306a\u305f\u306e\u7d44\u7e54\u306b\u3069\u306e\u3088\u3046\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u304b:]<\/b>  <\/p>\n<p><b>\u5f71\u97ff\u3092\u53d7\u3051\u308b\u4eba\u7269:<\/b><\/p>\n<p>  <\/p>\n<ul>  <\/p>\n<li>Microsoft Edge\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3059\u3079\u3066\u306e\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u30e6\u30fc\u30b6\u30fc\u306eWindows\u30e6\u30fc\u30b6\u30fc\u3067\u3059\u3002<\/li>\n<p>  <\/ul>\n<p>  <\/p>\n<p><b>\u4eca\u5f8c\u306e\u5c55\u958b:<\/b><\/p>\n<p>  <\/p>\n<ul>  <\/p>\n<li>Adobe\u642d\u8f09\u306ePDF\u30d3\u30e5\u30fc\u30a2\u304c\u3001\u5f93\u6765\u306e\u30ec\u30ac\u30b7\u30fc\u30d3\u30e5\u30fc\u30a2\u306b\u4ee3\u308f\u3063\u3066\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u4f53\u9a13\u3068\u306a\u308a\u307e\u3059\u3002<\/li>\n<p>  <\/p>\n<li>\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u64cd\u4f5c\u306f\u5909\u66f4\u3055\u308c\u305a\u3001<\/li>\n<p>  <\/p>\n<li>\u65b0\u3057\u3044\u30d3\u30e5\u30fc\u30a2\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5411\u4e0a\u3001\u30a2\u30af\u30bb\u30b9\u306e\u3057\u3084\u3059\u3055\u3001\u4e92\u63db\u6027\u3001\u305d\u3057\u3066\u72ec\u81ea\u306e\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/li>\n<p>  <\/ul>\n<p>\u7ba1\u7406\u8005\u306f2\u3064\u306e\u30dd\u30ea\u30b7\u30fc\u3067\u4f53\u9a13\u3092\u7ba1\u7406\u3067\u304d\u307e\u3059:<\/p>\n<p><a href=\"https:\/\/learn.microsoft.com\/deployedge\/microsoft-edge-browser-policies\/newpdfreaderenabled\" target=\"_blank\">NewPDFReaderEnabled<\/a>:Windows\u7248Edge for Windows\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30d3\u30e5\u30fc\u30a2\u3092\u5236\u5fa1\u3057\u307e\u3059\u3002&nbsp;<\/p>\n<p><a href=\"https:\/\/learn.microsoft.com\/deployedge\/microsoft-edge-webview-policies#newpdfreaderwebview2list\" target=\"_blank\">NewPDFReaderWebView2List<\/a>:WebView2\u30a2\u30d7\u30ea\u306e\u30d3\u30e5\u30fc\u30a2\u52d5\u4f5c\u3092\u5236\u5fa1\u3057\u307e\u3059\u3002&nbsp;<\/p>\n<p>  <\/p>\n<ul>  <\/ul>\n<p><b>\u653f\u7b56\u884c\u52d5:<\/b><\/p>\n<p>  <\/p>\n<table border=\"1\">  <\/p>\n<tbody>\n<tr>\n<th>\u65b9\u91dd\u72b6\u614b<\/th>\n<th>\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u5b9f\u73fe\u3059\u308b\u524d\u306e<\/th>\n<th>\u30c7\u30d5\u30a9\u30eb\u30c8\u306b\u3088\u308b\u5b9f\u73fe\u5f8c<\/th>\n<\/tr>\n<p>  <\/p>\n<tr>\n<td>\u30c7\u30d5\u30a9\u30eb\u30c8<\/td>\n<td>\u65e7PDF\u30d3\u30e5\u30fc\u30a2<\/td>\n<td>\u65b0\u3057\u3044PDF\u30d3\u30e5\u30fc\u30a2<\/td>\n<\/tr>\n<p>  <\/p>\n<tr>\n<td>\u6709\u52b9\u5316<\/td>\n<td>\u65b0\u3057\u3044PDF\u30d3\u30e5\u30fc\u30a2<\/td>\n<td>\u65b0\u3057\u3044PDF\u30d3\u30e5\u30fc\u30a2<\/td>\n<\/tr>\n<p>  <\/p>\n<tr>\n<td>\u969c\u5bb3\u8005<\/td>\n<td>\u65e7PDF\u30d3\u30e5\u30fc\u30a2<\/td>\n<td>\u65e7PDF\u30d3\u30e5\u30fc\u30a2<\/td>\n<\/tr>\n<p>  <\/tbody>\n<\/table>\n<p>  <b>[\u6e96\u5099\u306e\u305f\u3081\u306b\u3067\u304d\u308b\u3053\u3068:]<\/b>  <\/p>\n<ul>  <\/ul>\n<\/p>\n<p>\u7d44\u7e54\u304c\u65b0\u3057\u3044\u30d3\u30e5\u30fc\u30a2\u3092\u5c0e\u5165\u3059\u308b\u6e96\u5099\u304c\u3067\u304d\u3066\u3044\u308c\u3070\u3001\u4f55\u306e\u5bfe\u5fdc\u3082\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u4f53\u9a13\u3092\u7ba1\u7406\u3057\u305f\u3044\u5834\u5408:<\/p>\n<ul>\n<li><a href=\"https:\/\/learn.microsoft.com\/deployedge\/microsoft-edge-browser-policies\/newpdfreaderenabled\" target=\"_blank\">NewPDFReaderEnabled<\/a>\u30dd\u30ea\u30b7\u30fc\u3092\u4f7f\u3063\u3066\u65b0\u3057\u3044\u30d3\u30e5\u30fc\u30a2\u3092\u65e9\u671f\u306b\u6709\u52b9\u5316\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u540c\u3058\u30dd\u30ea\u30b7\u30fc\u3092\u7121\u52b9\u306b\u3057\u3066\u30aa\u30d7\u30c8\u30a2\u30a6\u30c8\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30aa\u30d7\u30c8\u30a2\u30a6\u30c8\u306f2026\u5e746\u6708\u307e\u3067\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3001\u305d\u306e\u6642\u70b9\u3067\u30dd\u30ea\u30b7\u30fc\u306f\u5ec3\u6b62\u3055\u308c\u3001\u6b8b\u308b\u7d44\u7e54\u306f\u65b0\u3057\u3044\u30d3\u30e5\u30fc\u30a2\u306b\u79fb\u3055\u308c\u307e\u3059\u3002&nbsp;<\/li>\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u5185\u90e8\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u78ba\u8a8d\u3057\u3001\u66f4\u65b0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u3053\u306e\u5909\u66f4\u3092\u30d8\u30eb\u30d7\u30c7\u30b9\u30af\u3084\u30b5\u30dd\u30fc\u30c8\u30c1\u30fc\u30e0\u306b\u4f1d\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ul>\n<ul>  <\/ul>\n<\/p>\n<p>\u8a73\u3057\u304f\u306f\u3053\u3061\u3089:&nbsp;<a href=\"https:\/\/techcommunity.microsoft.com\/blog\/microsoftedgeinsider\/microsoft-edge-and-adobe-partner-to-improve-the-pdf-experience\/3733481\" target=\"_blank\" style=\"font-family: sans-serif;font-weight: 400\">Microsoft   Edge\u3068Adobe\u304c\u5354\u529b\u3057\u3066PDF\u4f53\u9a13\u3092\u5411\u4e0a\u3055\u305b\u308b<\/a>\u3002<\/p>\n<p>\u30b5\u30dd\u30fc\u30c8\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001Microsoft CSAM\u307e\u305f\u306fCSS\u306e\u62c5\u5f53\u8005\u306b\u304a\u554f\u3044\u5408\u308f\u305b\u304f\u3060\u3055\u3044\u3002<\/p>\n<div><b>[\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u4e0a\u306e\u8003\u616e\u4e8b\u9805:]<\/b><\/div>\n<div>\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u4e0a\u306e\u61f8\u5ff5\u4e8b\u9805\u306f\u7279\u5b9a\u3055\u308c\u305a\u3001\u7d44\u7e54\u306b\u5fdc\u3058\u3066\u30ec\u30d3\u30e5\u30fc\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>MC1154300 | New PDF Viewer Enabled by Default in Microsoft Edge Starting October 2025 Classification planForCh [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-15833","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15833","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/comments?post=15833"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15833\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=15833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=15833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=15833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}