{"id":16685,"date":"2026-06-04T08:01:59","date_gmt":"2026-06-03T23:01:59","guid":{"rendered":"https:\/\/m365jp.net\/?p=16685"},"modified":"2026-06-04T08:04:12","modified_gmt":"2026-06-03T23:04:12","slug":"mc1338819-microsoft-edge-enterprise-webview2-runtime-downgrade-via-downgrade-version-policy","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-06-04-mc1338819-microsoft-edge-enterprise-webview2-runtime-downgrade-via-downgrade-version-policy","title":{"rendered":"MC1338819 | Microsoft Edge: Enterprise WebView2 runtime downgrade via Downgrade Version policy"},"content":{"rendered":"<div class=\"postie-post\">\n<div>\n<hr>\n<table id=\"section\">\n<tbody>\n<tr>\n<th width=\"95%\">MC1338819 | Microsoft Edge: Enterprise WebView2 runtime downgrade via Downgrade Version policy<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr>\n<table id=\"data\">\n<tbody>\n<tr>\n<th>Classification<\/th>\n<td>stayInformed<\/td>\n<\/tr>\n<tr>\n<th>Last Updated<\/th>\n<td>06\/03\/2026 22:48:39<\/td>\n<\/tr>\n<tr>\n<th>Start Time<\/th>\n<td>06\/03\/2026 22:48:31<\/td>\n<\/tr>\n<tr>\n<th>End Time<\/th>\n<td>07\/11\/2026 07:00:00<\/td>\n<\/tr>\n<tr>\n<th>Message Content<\/th>\n<td>\n<p><b>[What and Why:]<\/b><\/p>\n<p>To help enterprises respond quickly to critical application regressions, Microsoft is introducing a new  <b>Downgrade Version<\/b> policy for the <b>Microsoft Edge WebView2 Evergreen Runtime<\/b>. This policy enables administrators to temporarily roll back WebView2 to a previous supported version (N\u20111 or N\u20112) on a  <b>per\u2011application basis<\/b>, without disabling Evergreen updates entirely.<\/p>\n<p>This change strengthens enterprise\u2011grade manageability, giving admins a controlled, time\u2011bound mitigation option while maintaining the security and update benefits of Evergreen servicing.<\/p>\n<p>This message is associated with Roadmap ID <a href=\"https:\/\/www.microsoft.com\/microsoft-365\/roadmap?filters=&amp;searchterms=561329\" target=\"_blank\">  561329<\/a>.<\/p>\n<p><b>[Rollout Schedule:]<\/b><\/p>\n<p>  <\/p>\n<ul>  <\/ul>\n<p>General Availability (Worldwide):&nbsp; We will begin rolling out in <b>early June 2026<\/b> and expect to complete by  <b>mid-June 2026<\/b>.<\/p>\n<ul>  <\/ul>\n<p><b>[Impact on Your Organization:]<\/b><\/p>\n<p>  <\/p>\n<p><b>Who is affected:<\/b><\/p>\n<p>Organizations managing <b>enterprise\u2011managed Windows devices<\/b> (domain\u2011joined or MDM\u2011enrolled) that use  <b>WebView2\u2011based applications<\/b><\/p>\n<p><b>Platforms\/Services:<\/b><\/p>\n<p>  <\/p>\n<ul>  <\/p>\n<li>Windows devices<\/li>\n<p>  <\/p>\n<li>Microsoft Edge WebView2 Evergreen Runtime<\/li>\n<p>  <\/p>\n<li>Group Policy \/ MDM (msedgewebview2.admx)<\/li>\n<p>  <\/ul>\n<p><b>What will happen:<\/b><\/p>\n<p>  <\/p>\n<ul>  <\/p>\n<li>A new <b>Downgrade Version <\/b>policy becomes available in <b>msedgewebview2.admx<\/b>.<\/li>\n<p>  <\/p>\n<li>Admins can map specific application executables to a previous WebView2 version (N\u20111 or N\u20112).<\/li>\n<p>  <\/p>\n<li>The <b>Edge Updater<\/b> installs the target version side\u2011by\u2011side.<\/li>\n<p>  <\/p>\n<li>The <b>WebView2 Loader<\/b> redirects only the targeted apps.<\/li>\n<p>  <\/p>\n<li>Downgrades <b>automatically expire<\/b> as new WebView2 versions are released:\n<ul>\n<li>Apps pinned to <b>N\u20111<\/b> remain on that version until the next release (then move forward).<\/li>\n<li>Apps pinned to <b>N\u20112<\/b> revert automatically to the current Evergreen version.<\/li>\n<\/ul>\n<\/li>\n<li>The policy applies only to enterprise\u2011managed devices.<\/li>\n<p>  <\/p>\n<li>No change occurs unless the policy is explicitly configured.<\/li>\n<p>  <\/ul>\n<p><b>[Action Required \/ Recommendations:]<\/b><\/p>\n<p>  <\/p>\n<p><b>No action is required<\/b> before rollout.<\/p>\n<p>Recommended actions:<\/p>\n<ul>  <\/p>\n<li>Review existing Group Policy or registry configurations related to WebView2 to understand potential usage scenarios.<\/li>\n<li>Update internal incident response or app compatibility playbooks to include this downgrade option.<\/li>\n<li>Share guidance with application owners on when and how to request a temporary WebView2 rollback.<\/li>\n<\/ul>\n<p><b>Learn more: <\/b><a href=\"https:\/\/learn.microsoft.com\/deployedge\/microsoft-edge-webview-policies#downgradeversion\" target=\"_blank\">Microsoft Edge WebView2 Policy Documentation | Microsoft Learn<\/a><\/p>\n<p><b>[Compliance considerations:]<\/b><\/p>\n<p>  An admin control is added that allows configuration of WebView2 runtime versions per application. No other compliance impacts are identified.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<th>Machine Translation<\/th>\n<td>\n<p><b>[\u4f55\u3068\u306a\u305c:]<\/b><\/p>\n<p>\u4f01\u696d\u304c\u91cd\u8981\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u56de\u5e30\u306b\u8fc5\u901f\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u3088\u3046\u3001Microsoft<b>\u306fMicrosoft Edge WebView2 Evergreen Runtime<\/b>\u5411\u3051\u306b\u65b0\u3057\u3044<b>\u30c0\u30a6\u30f3\u30b0\u30ec\u30fc\u30c9\u30d0\u30fc\u30b8\u30e7\u30f3<\/b>\u30dd\u30ea\u30b7\u30fc\u3092\u5c0e\u5165\u3057\u307e\u3059\u3002\u3053\u306e\u30dd\u30ea\u30b7\u30fc\u306b\u3088\u308a\u3001\u7ba1\u7406\u8005\u306fEvergreen\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3092\u5b8c\u5168\u306b\u7121\u52b9\u5316\u3059\u308b\u3053\u3068\u306a\u304f\u3001<b>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3054\u3068\u306b<\/b>WebView2\u3092\u4ee5\u524d\u306e\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u30d0\u30fc\u30b8\u30e7\u30f3(N-1\u307e\u305f\u306fN-2)\u306b\u4e00\u6642\u7684\u306b\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u5909\u66f4\u306b\u3088\u308a\u3001\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u30ec\u30d9\u30eb\u306e\u7ba1\u7406\u6027\u304c\u5f37\u5316\u3055\u308c\u3001\u7ba1\u7406\u8005\u306fEvergreen\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306e\u5229\u70b9\u3092\u7dad\u6301\u3057\u3064\u3064\u3001\u7ba1\u7406\u3055\u308c\u305f\u6642\u9593\u5236\u9650\u306e\u3042\u308b\u7de9\u548c\u30aa\u30d7\u30b7\u30e7\u30f3\u304c\u63d0\u4f9b\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u30ed\u30fc\u30c9\u30de\u30c3\u30d7ID <a href=\"https:\/\/www.microsoft.com\/microsoft-365\/roadmap?filters=&amp;searchterms=561329\" target=\"_blank\">  561329<\/a>\u306b\u95a2\u9023\u4ed8\u3051\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><b>[\u5c55\u958b\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb:]<\/b><\/p>\n<p>  <\/p>\n<ul>  <\/ul>\n<p>\u4e00\u822c\u516c\u958b(\u4e16\u754c\u5c55\u958b):&nbsp; <b>2026\u5e746\u6708\u521d<\/b> \u65ec\u306b\u5c55\u958b\u3092\u958b\u59cb\u3057\u3001 <b>2026\u5e746\u6708\u4e2d\u65ec<\/b>\u307e\u3067\u306b\u5b8c\u4e86\u3059\u308b\u4e88\u5b9a\u3067\u3059\u3002<\/p>\n<ul>  <\/ul>\n<p><b>[\u7d44\u7e54\u3078\u306e\u5f71\u97ff:]<\/b><\/p>\n<p>  <\/p>\n<p><b>\u5f71\u97ff\u3092\u53d7\u3051\u308b\u4eba\u7269:<\/b><\/p>\n<p><b>WebView2\u30d9\u30fc\u30b9\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/b>\u3092\u4f7f\u7528\u3059\u308b<b>\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u7ba1\u7406\u306eWindows\u30c7\u30d0\u30a4\u30b9<\/b>(\u30c9\u30e1\u30a4\u30f3\u53c2\u52a0\u307e\u305f\u306fMDM\u767b\u9332)\u3092\u7ba1\u7406\u3059\u308b\u7d44\u7e54<\/p>\n<p><b>\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\/\u30b5\u30fc\u30d3\u30b9:<\/b><\/p>\n<p>  <\/p>\n<ul>  <\/p>\n<li>Windows\u30c7\u30d0\u30a4\u30b9<\/li>\n<p>  <\/p>\n<li>Microsoft Edge WebView2 Evergreen Runtime<\/li>\n<p>  <\/p>\n<li>\u30b0\u30eb\u30fc\u30d7\u30dd\u30ea\u30b7\u30fc \/ MDM(msedgewebview2.admx)<\/li>\n<p>  <\/ul>\n<p><b>\u4eca\u5f8c\u306e\u5c55\u958b:<\/b><\/p>\n<p>  <\/p>\n<ul>  <\/p>\n<li><b>msedgewebview2.admx<\/b>\u3067\u65b0\u3057\u3044<b>\u30c0\u30a6\u30f3\u30b0\u30ec\u30fc\u30c9\u30d0\u30fc\u30b8\u30e7\u30f3<\/b>\u30dd\u30ea\u30b7\u30fc\u304c\u5229\u7528\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<p>  <\/p>\n<li>\u7ba1\u7406\u8005\u306f\u7279\u5b9a\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5b9f\u884c\u30d5\u30a1\u30a4\u30eb\u3092\u4ee5\u524d\u306eWebView2\u30d0\u30fc\u30b8\u30e7\u30f3(N-1\u307e\u305f\u306fN-2)\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3067\u304d\u307e\u3059\u3002<\/li>\n<p>  <\/p>\n<li><b>Edge Updater<\/b>\u306f\u30bf\u30fc\u30b2\u30c3\u30c8\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4e26\u3079\u3066\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059\u3002<\/li>\n<p>  <\/p>\n<li><b>WebView2\u30ed\u30fc\u30c0\u30fc<\/b>\u306f\u30bf\u30fc\u30b2\u30c3\u30c8\u30a2\u30d7\u30ea\u306e\u307f\u3092\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3057\u307e\u3059\u3002<\/li>\n<p>  <\/p>\n<li>\u30c0\u30a6\u30f3\u30b0\u30ec\u30fc\u30c9\u306f\u65b0\u3057\u3044WebView2\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u308b\u3068 <b>\u81ea\u52d5\u7684\u306b\u671f\u9650\u5207\u308c<\/b> \u306b\u306a\u308a\u307e\u3059:\n<ul>\n<li><b>N-1<\/b>\u306b\u30d4\u30f3\u7559\u3081\u3055\u308c\u305f\u30a2\u30d7\u30ea\u306f\u6b21\u306e\u30ea\u30ea\u30fc\u30b9\u307e\u3067\u305d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u6b8b\u308a\u307e\u3059(\u305d\u306e\u5f8c\u306f\u5148\u306b\u9032\u307f\u307e\u3059)\u3002<\/li>\n<li><b>N-2<\/b>\u306b\u30d4\u30f3\u7559\u3081\u3055\u308c\u305f\u30a2\u30d7\u30ea\u306f\u81ea\u52d5\u7684\u306b\u73fe\u5728\u306eEvergreen\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u623b\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u3053\u306e\u30dd\u30ea\u30b7\u30fc\u306f\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba\u7ba1\u7406\u30c7\u30d0\u30a4\u30b9\u306b\u306e\u307f\u9069\u7528\u3055\u308c\u307e\u3059\u3002<\/li>\n<p>  <\/p>\n<li>\u30dd\u30ea\u30b7\u30fc\u304c\u660e\u793a\u7684\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u9650\u308a\u3001\u5909\u66f4\u306f\u8d77\u3053\u308a\u307e\u305b\u3093\u3002<\/li>\n<p>  <\/ul>\n<p><b>[\u884c\u52d5\u304c\u5fc5\u8981\/\u63a8\u5968\u4e8b\u9805:]<\/b><\/p>\n<p>  <\/p>\n<p>\u5c55\u958b\u524d\u306b<b>\u4f55\u306e\u30a2\u30af\u30b7\u30e7\u30f3\u3082\u5fc5\u8981<\/b>\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u63a8\u5968\u3055\u308c\u308b\u884c\u52d5:<\/p>\n<ul>  <\/p>\n<li>WebView2\u306b\u95a2\u9023\u3059\u308b\u65e2\u5b58\u306e\u30b0\u30eb\u30fc\u30d7\u30dd\u30ea\u30b7\u30fc\u3084\u30ec\u30b8\u30b9\u30c8\u30ea\u8a2d\u5b9a\u3092\u78ba\u8a8d\u3057\u3001\u6f5c\u5728\u7684\u306a\u4f7f\u7528\u30b7\u30ca\u30ea\u30aa\u3092\u7406\u89e3\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u793e\u5185\u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u5bfe\u5fdc\u3084\u30a2\u30d7\u30ea\u4e92\u63db\u6027\u30d7\u30ec\u30a4\u30d6\u30c3\u30af\u3092\u66f4\u65b0\u3057\u3066\u3001\u3053\u306e\u30c0\u30a6\u30f3\u30b0\u30ec\u30fc\u30c9\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u542b\u3081\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u6240\u6709\u8005\u306b\u3001WebView2\u306e\u4e00\u6642\u7684\u306a\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u3044\u3064\u3069\u306e\u3088\u3046\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u3059\u308b\u304b\u306b\u3064\u3044\u3066\u306e\u30ac\u30a4\u30c0\u30f3\u30b9\u3092\u5171\u6709\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<\/ul>\n<p><b>\u8a73\u7d30\u306f\u3053\u3061\u3089: <\/b><a href=\"https:\/\/learn.microsoft.com\/deployedge\/microsoft-edge-webview-policies#downgradeversion\" target=\"_blank\">Microsoft Edge WebView2\u30dd\u30ea\u30b7\u30fc\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8 |Microsoft Learn<\/a><\/p>\n<p><b>[\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u4e0a\u306e\u8003\u616e\u4e8b\u9805:]<\/b><\/p>\n<p>\u7ba1\u7406\u8005\u5236\u5fa1\u304c\u8ffd\u52a0\u3055\u308c\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3054\u3068\u306bWebView2\u306e\u30e9\u30f3\u30bf\u30a4\u30e0\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002\u4ed6\u306b\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u3078\u306e\u5f71\u97ff\u306f\u78ba\u8a8d\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>MC1338819 | Microsoft Edge: Enterprise WebView2 runtime downgrade via Downgrade Version policy Classification  [&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-16685","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/16685","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=16685"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/16685\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=16685"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=16685"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=16685"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}