{"id":19139,"date":"2026-10-22T09:02:38","date_gmt":"2026-10-22T00:02:38","guid":{"rendered":"https:\/\/m365jp.net\/?p=19139"},"modified":"2026-10-22T09:07:28","modified_gmt":"2026-10-22T00:07:28","slug":"mc1519866-microsoft-teams-phishing-detection-for-messaging","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-10-22-mc1519866-microsoft-teams-phishing-detection-for-messaging","title":{"rendered":"MC1519866 | Microsoft Teams: Phishing detection for messaging"},"content":{"rendered":"<div class=\"postie-post\">\n<div>&#013; <\/p>\n<hr>\n<p>&#013; <\/p>\n<table id=\"section\">&#013; <\/p>\n<tbody>&#013; <\/p>\n<tr>&#013; <\/p>\n<th width=\"95%\">MC1519866 | Microsoft Teams: Phishing detection for messaging<\/th>\n<p>&#013; <\/tr>\n<p>&#013; <\/tbody>\n<p>&#013; <\/table>\n<p>&#013; <\/p>\n<hr>\n<p>&#013; <\/p>\n<table id=\"data\">&#013; <\/p>\n<tbody>&#013; <\/p>\n<tr>&#013; <\/p>\n<th>Classification<\/th>\n<p>&#013; <\/p>\n<td>stayInformed<\/td>\n<p>&#013; <\/tr>\n<p>&#013; <\/p>\n<tr>&#013; <\/p>\n<th>Last Updated<\/th>\n<p>&#013; <\/p>\n<td>10\/21\/2026 23:32:43<\/td>\n<p>&#013; <\/tr>\n<p>&#013; <\/p>\n<tr>&#013; <\/p>\n<th>Start Time<\/th>\n<p>&#013; <\/p>\n<td>10\/21\/2026 23:32:30<\/td>\n<p>&#013; <\/tr>\n<p>&#013; <\/p>\n<tr>&#013; <\/p>\n<th>End Time<\/th>\n<p>&#013; <\/p>\n<td>01\/17\/2027 08:00:00<\/td>\n<p>&#013; <\/tr>\n<p>&#013; <\/p>\n<tr>&#013; <\/p>\n<th>Message Content<\/th>\n<p>&#013; <\/p>\n<td>&#013; <\/p>\n<p><b>[What and why]<\/b><\/p>\n<p>&#013; <\/p>\n<p>Microsoft Teams is introducing AI-powered, context-aware phishing detection to help identify phishing, social engineering, impersonation attempts, and deceptive intent. The capability analyzes conversation context to identify suspicious behavior that may&#013;  not include traditional indicators such as malicious links or files.<\/p>\n<p>&#013; <\/p>\n<p><b>[Rollout schedule]<\/b><\/p>\n<p>&#013; <\/p>\n<ul>&#013; <\/p>\n<li> <b>Targeted Release:<\/b> Beginning in <b>early November 2026<\/b> and expected to complete by&#013; <b>mid-November 2026<\/b> <\/li>\n<li> <b>General Availability (Worldwide):<\/b> Beginning in <b>early December 2026<\/b> and expected to complete by&#013; <b>mid-December 2026<\/b> <\/li>\n<\/ul>\n<p>&#013; <\/p>\n<p><b>[Impact on your organization]<\/b><\/p>\n<p>&#013; <\/p>\n<p><i>Who is affected<\/i><\/p>\n<p>&#013; <\/p>\n<ul>&#013; <\/p>\n<li>For most users, detection focuses on external first-contact chats.<\/li>\n<li>Teams mobile users in China may also receive additional phishing and fraud protection for in-tenant conversations.<\/li>\n<\/ul>\n<p>&#013; <\/p>\n<p><i>Platforms and services<\/i><\/p>\n<p>&#013; <\/p>\n<ul>&#013; <\/p>\n<li>Microsoft Teams<\/li>\n<\/ul>\n<p>&#013; <\/p>\n<p><i>What will happen<\/i><\/p>\n<p>&#013; <\/p>\n<ul>&#013; <\/p>\n<li>Teams will use AI-powered, context-aware detection to identify potential phishing and related suspicious behavior.<\/li>\n<li>During initial quality validation, detection may run in the background without showing warnings to users.<\/li>\n<li>After validation, users may see a warning when potential phishing is detected:&nbsp;<\/li>\n<\/ul>\n<p>&#013; <\/p>\n<p class=\"ql-indent-1\"><img decoding=\"async\" width=\"400\" src=\"\/\/support.microsoft.com\/en-us\/customercomms\/media\/messagecenter\/2026\/10\/22201.png\"><\/p>\n<p>&#013; <\/p>\n<ul>&#013; <\/p>\n<li>For Teams mobile users in China, additional protection may also apply to in-tenant conversations to address fraud patterns observed in the region.<\/li>\n<li>This capability is used only for security protection and not for productivity, summarization, advertising, user monitoring, or other non-security purposes.<\/li>\n<li>Customer message content is not retained by the detection system for model training or other secondary uses.<\/li>\n<li>No new admin configuration is required.<\/li>\n<\/ul>\n<p>&#013; <\/p>\n<p><b>[Action required and recommendations]<\/b><\/p>\n<p>&#013; <\/p>\n<p>No admin action is required to enable this protection.<\/p>\n<p>&#013; <\/p>\n<p>We recommend that admins review organizational guidance for interacting with unfamiliar external contacts and remind users to report suspicious activity or incorrect detections through available Teams reporting experiences.<\/p>\n<p>&#013; <\/p>\n<p><b>Learn more<\/b><\/p>\n<p>&#013; <\/p>\n<ul>&#013; <\/p>\n<li><a href=\"https:\/\/support.microsoft.com\/teams\/chat\/phishing-content-detection-microsoft-teams\" rel=\"noopener noreferrer\" target=\"_blank\">Phishing content detection in Microsoft Teams | Microsoft Support<\/a><\/li>\n<\/ul>\n<p>&#013; <\/p>\n<p><b>[Compliance considerations]<\/b><\/p>\n<p>&#013; <\/p>\n<table style=\"border: 1px solid #000\">&#013; <\/p>\n<tbody>&#013; <\/p>\n<tr>&#013; <\/p>\n<td data-row=\"row-ca43\">Question<\/td>\n<p>&#013; <\/p>\n<td data-row=\"row-ca43\">Answer<\/td>\n<p>&#013; <\/tr>\n<p>&#013; <\/p>\n<tr>&#013; <\/p>\n<td data-row=\"row-em4r\">Does the change alter how existing customer data is processed, stored, or accessed?<\/td>\n<p>&#013; <\/p>\n<td data-row=\"row-em4r\">Yes. Teams analyzes conversation context to detect suspicious behavior. The request states that customer message content is not retained by the detection system for model training or other secondary uses.<\/td>\n<p>&#013; <\/tr>\n<p>&#013; <\/p>\n<tr>&#013; <\/p>\n<td data-row=\"row-dlaz\">Does the change introduce or significantly modify AI\/ML capabilities that interact with customer data?<\/td>\n<p>&#013; <\/p>\n<td data-row=\"row-dlaz\">Yes. The change introduces AI-powered, context-aware detection that analyzes conversation context for phishing, social engineering, impersonation attempts, and deceptive intent.<\/td>\n<p>&#013; <\/tr>\n<p>&#013; <\/tbody>\n<p>&#013; <\/table>\n<p>&#013; <\/td>\n<p>&#013; <\/tr>\n<p>&#013; <\/p>\n<tr>&#013; <\/p>\n<th>Machine Translation<\/th>\n<p>&#013; <\/p>\n<td>&#013; <\/p>\n<p><b>[\u4f55\u3068\u306a\u305c]<\/b><\/p>\n<p>&#013; <\/p>\n<p>Microsoft Teams\u306f\u3001\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3001\u30bd\u30fc\u30b7\u30e3\u30eb\u30a8\u30f3\u30b8\u30cb\u30a2\u30ea\u30f3\u30b0\u3001\u306a\u308a\u3059\u307e\u3057\u3001\u6b3a\u779e\u7684\u610f\u56f3\u3092\u7279\u5b9a\u3059\u308b\u305f\u3081\u306b\u3001AI\u642d\u8f09\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u8a8d\u8b58\u578b\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u691c\u51fa\u6a5f\u80fd\u3092\u5c0e\u5165\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u6a5f\u80fd\u306f\u3001\u4f1a\u8a71\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u5206\u6790\u3057\u3001\u60aa\u610f\u306e\u3042\u308b\u30ea\u30f3\u30af\u3084\u30d5\u30a1\u30a4\u30eb\u306a\u3069\u306e\u5f93\u6765\u306e\u6307\u6a19\u3092\u542b\u307e\u306a\u3044\u4e0d\u5be9\u306a\u884c\u52d5\u3092\u7279\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>&#013; <\/p>\n<p><b>[\u5c55\u958b\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb]<\/b><\/p>\n<p>&#013; <\/p>\n<ul>&#013; <\/p>\n<li> <b>\u30ea\u30ea\u30fc\u30b9\u4e88\u5b9a:<\/b><b>2026\u5e7411\u6708\u521d<\/b>\u65ec\u304b\u3089\u59cb\u307e\u308a\u3001<b>2026\u5e7411\u6708\u4e2d\u65ec<\/b>\u307e\u3067\u306b\u5b8c\u4e86\u3059\u308b\u4e88\u5b9a\u3067\u3059<\/li>\n<li> <b>\u4e00\u822c\u516c\u958b(\u4e16\u754c):<\/b><b>2026\u5e7412\u6708\u521d\u65ec<\/b>\u304b\u3089\u958b\u59cb\u3055\u308c\u3001<b>\u540c\u5e7412\u6708\u4e2d\u65ec<\/b>\u307e\u3067\u306b\u5b8c\u4e86\u3059\u308b\u4e88\u5b9a\u3067\u3059<\/li>\n<\/ul>\n<p>&#013; <\/p>\n<p><b>[\u7d44\u7e54\u3078\u306e\u5f71\u97ff]<\/b><\/p>\n<p>&#013; <\/p>\n<p><i>\u5f71\u97ff\u3092\u53d7\u3051\u308b\u4eba\u7269<\/i><\/p>\n<p>&#013; <\/p>\n<ul>&#013; <\/p>\n<li>\u307b\u3068\u3093\u3069\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u3001\u691c\u51fa\u306f\u5916\u90e8\u306e\u30d5\u30a1\u30fc\u30b9\u30c8\u30b3\u30f3\u30bf\u30af\u30c8\u30c1\u30e3\u30c3\u30c8\u306b\u7126\u70b9\u3092\u5f53\u3066\u3066\u3044\u307e\u3059\u3002<\/li>\n<li>\u4e2d\u56fd\u306eTeams\u30e2\u30d0\u30a4\u30eb\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u30c6\u30ca\u30f3\u30c8\u5185\u306e\u4f1a\u8a71\u306b\u5bfe\u3057\u3066\u8ffd\u52a0\u306e\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3084\u8a50\u6b3a\u5bfe\u7b56\u3092\u53d7\u3051\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>&#013; <\/p>\n<p><i>\u30db\u30fc\u30e0\u3068\u30b5\u30fc\u30d3\u30b9<\/i><\/p>\n<p>&#013; <\/p>\n<ul>&#013; <\/p>\n<li>Microsoft Teams<\/li>\n<\/ul>\n<p>&#013; <\/p>\n<p><i>\u4f55\u304c\u8d77\u3053\u308b\u306e\u304b<\/i><\/p>\n<p>&#013; <\/p>\n<ul>&#013; <\/p>\n<li>\u30c1\u30fc\u30e0\u306fAI\u642d\u8f09\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u8a8d\u8b58\u578b\u691c\u51fa\u3092\u7528\u3044\u3066\u3001\u6f5c\u5728\u7684\u306a\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u3084\u95a2\u9023\u3059\u308b\u4e0d\u5be9\u306a\u884c\u52d5\u3092\u7279\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<li>\u521d\u671f\u306e\u54c1\u8cea\u691c\u8a3c\u4e2d\u3001\u691c\u51fa\u306f\u30e6\u30fc\u30b6\u30fc\u306b\u8b66\u544a\u3092\u8868\u793a\u305b\u305a\u306b\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u3067\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li>\u691c\u8a3c\u5f8c\u3001\u6f5c\u5728\u7684\u306a\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u304c\u691c\u51fa\u3055\u308c\u305f\u969b\u306b\u8b66\u544a\u304c\u8868\u793a\u3055\u308c\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059:&nbsp;<\/li>\n<\/ul>\n<p>&#013; <\/p>\n<p class=\"ql-indent-1\"><img decoding=\"async\" width=\"400\" src=\"\/\/support.microsoft.com\/en-us\/customercomms\/media\/messagecenter\/2026\/10\/22201.png\"><\/p>\n<p>&#013; <\/p>\n<ul>&#013; <\/p>\n<li>\u4e2d\u56fd\u306eTeams\u30e2\u30d0\u30a4\u30eb\u30e6\u30fc\u30b6\u30fc\u5411\u3051\u306b\u306f\u3001\u5730\u57df\u3067\u89b3\u5bdf\u3055\u308c\u305f\u4e0d\u6b63\u884c\u70ba\u306e\u30d1\u30bf\u30fc\u30f3\u306b\u5bfe\u51e6\u3059\u308b\u305f\u3081\u3001\u30c6\u30ca\u30f3\u30c8\u5185\u306e\u4f1a\u8a71\u306b\u3082\u8ffd\u52a0\u306e\u4fdd\u8b77\u304c\u9069\u7528\u3055\u308c\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li>\u3053\u306e\u6a5f\u80fd\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4fdd\u8b77\u306e\u305f\u3081\u306e\u307f\u4f7f\u7528\u3055\u308c\u3001\u751f\u7523\u6027\u3001\u8981\u7d04\u3001\u5e83\u544a\u3001\u30e6\u30fc\u30b6\u30fc\u76e3\u8996\u3001\u305d\u306e\u4ed6\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4ee5\u5916\u306e\u76ee\u7684\u306b\u306f\u4f7f\u7528\u3055\u308c\u307e\u305b\u3093\u3002<\/li>\n<li>\u9867\u5ba2\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u5185\u5bb9\u306f\u3001\u30e2\u30c7\u30eb\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u3084\u305d\u306e\u4ed6\u306e\u4e8c\u6b21\u7528\u9014\u306e\u305f\u3081\u306b\u691c\u51fa\u30b7\u30b9\u30c6\u30e0\u306b\u3088\u3063\u3066\u4fdd\u6301\u3055\u308c\u307e\u305b\u3093\u3002<\/li>\n<li>\u65b0\u3057\u3044\u7ba1\u7406\u8005\u8a2d\u5b9a\u306f\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u3002<\/li>\n<\/ul>\n<p>&#013; <\/p>\n<p><b>[\u884c\u52d5\u304c\u5fc5\u8981\u3068\u63d0\u8a00]<\/b><\/p>\n<p>&#013; <\/p>\n<p>\u3053\u306e\u4fdd\u8b77\u3092\u6709\u52b9\u306b\u3059\u308b\u305f\u3081\u306b\u7ba1\u7406\u8005\u306e\u64cd\u4f5c\u306f\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>&#013; <\/p>\n<p>\u7ba1\u7406\u8005\u306b\u306f\u3001\u898b\u77e5\u3089\u306c\u5916\u90e8\u9023\u7d61\u5148\u3068\u306e\u3084\u308a\u53d6\u308a\u306b\u95a2\u3059\u308b\u7d44\u7e54\u306e\u30ac\u30a4\u30c0\u30f3\u30b9\u3092\u78ba\u8a8d\u3057\u3001Teams\u306e\u5831\u544a\u4f53\u9a13\u3092\u901a\u3058\u3066\u4e0d\u5be9\u306a\u6d3b\u52d5\u3084\u8aa4\u3063\u305f\u691c\u51fa\u3092\u5831\u544a\u3059\u308b\u3088\u3046\u30e6\u30fc\u30b6\u30fc\u306b\u30ea\u30de\u30a4\u30f3\u30c0\u30fc\u3059\u308b\u3088\u3046\u63a8\u5968\u3057\u307e\u3059\u3002<\/p>\n<p>&#013; <\/p>\n<p><b>\u8a73\u3057\u304f\u306f\u3053\u3061\u3089<\/b><\/p>\n<p>&#013; <\/p>\n<ul>&#013; <\/p>\n<li><a href=\"https:\/\/support.microsoft.com\/teams\/chat\/phishing-content-detection-microsoft-teams\" rel=\"noopener noreferrer\" target=\"_blank\">Microsoft Teams\u306b\u304a\u3051\u308b\u30d5\u30a3\u30c3\u30b7\u30f3\u30b0\u30b3\u30f3\u30c6\u30f3\u30c4\u691c\u51fa |Microsoft\u30b5\u30dd\u30fc\u30c8<\/a><\/li>\n<\/ul>\n<p>&#013; 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