{"id":16118,"date":"2026-04-25T07:01:34","date_gmt":"2026-04-24T22:01:34","guid":{"rendered":"https:\/\/m365jp.net\/?p=16118"},"modified":"2026-04-25T07:06:12","modified_gmt":"2026-04-24T22:06:12","slug":"mc1290822-microsoft-outlook-copilot-account-switcher-in-the-outlook-side-pane","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-04-25-mc1290822-microsoft-outlook-copilot-account-switcher-in-the-outlook-side-pane","title":{"rendered":"MC1290822 | Microsoft Outlook: Copilot account switcher in the Outlook side pane"},"content":{"rendered":"<div class=\"postie-post\">\n<div>\n<hr>\n<table id=\"section\">\n<tbody>\n<tr>\n<th width=\"95%\">MC1290822 | Microsoft Outlook: Copilot account switcher in the Outlook side pane<\/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\/24\/2026 21:44:52<\/td>\n<\/tr>\n<tr>\n<th>Start Time<\/th>\n<td>04\/24\/2026 21:44:10<\/td>\n<\/tr>\n<tr>\n<th>End Time<\/th>\n<td>07\/15\/2026 07:00:00<\/td>\n<\/tr>\n<tr>\n<th>Message Content<\/th>\n<td>\n<p><b>[Introduction]<\/b><\/p>\n<p>Microsoft is introducing a <b>Copilot account switcher<\/b> in the Copilot side pane in the  <i>new Outlook for Windows<\/i>. The account switcher shows the active Copilot\u2011enabled account and allows users to change the Copilot account used in the side pane in supported experiences.<\/p>\n<p>This message is associated with <b>Microsoft 365 Roadmap ID <a href=\"https:\/\/www.microsoft.com\/microsoft-365\/roadmap?filters=&amp;searchterms=559991\" target=\"_blank\">  559991<\/a><\/b>.<\/p>\n<p><b>[When this will happen]<\/b><\/p>\n<ul>\n<li><b>Targeted Release: <\/b>Rollout will begin in<b> late April 2026 <\/b>and is expected to complete by  <b>mid-May 2026<\/b>.<\/li>\n<li><b>General Availability (Worldwide): <\/b>Rollout will begin in <b>mid-May 2026<\/b> and is expected to complete by  <b>mid-June 2026<\/b>.<\/li>\n<\/ul>\n<p><b>[How this affects your organization]<\/b><\/p>\n<p><i>Who is affected<\/i><\/p>\n<ul>\n<li>Users in Microsoft 365 tenants using the <b>new Outlook for Windows<\/b><\/li>\n<li>Only users with <b>multiple Copilot-enabled accounts<\/b> configured in<i> Outlook<\/i><\/li>\n<\/ul>\n<p><i>What will happen<\/i><\/p>\n<ul>\n<li>Users will see a <b>new account selector <\/b>at the top of the <i><b>Copilot side pane<\/b><\/i> in  <i>supported experiences<\/i>.<\/li>\n<li>The selector shows the currently active Copilot-enabled account.<\/li>\n<li>The account selector appears only when multiple Copilot-enabled accounts are available and the account context may be ambiguous (for example, certain Calendar experiences).<\/li>\n<li>Users will be able to switch Copilot accounts within the Copilot side pane without changing Outlook\u2019s broader account context.<\/li>\n<li>If you are using Mail, you will not see the Copilot account switcher.&nbsp;<\/li>\n<li>There is <b>no impact for users with a single Copilot-enabled account<\/b>.<\/li>\n<li>The feature is <b>enabled by default<\/b> and respects existing Copilot availability and licensing.<\/li>\n<li>The Copilot account switcher is <b>available to users with Microsoft 365 Copilot (Premium) and Copilot Chat (Basic)<\/b>.  <\/li>\n<li>This is a multi-account feature and <b>requires at least two Copilot-enabled accounts<\/b>, in any combination of Premium and\/or Basic.  <\/li>\n<\/ul>\n<p><b>[What you can do to prepare]<\/b><\/p>\n<p>No action is required.<\/p>\n<p>To prepare for user questions, we recommend that administrators:<\/p>\n<ul>\n<li>Update internal documentation for Copilot usage in <i>multi-account scenarios<\/i>.<\/li>\n<li>Inform users who work across multiple accounts how to confirm or change the active Copilot account in the  <i>Copilot side pane<\/i>.<\/li>\n<li>Update helpdesk guidance for users who have multiple Outlook accounts configured.<\/li>\n<\/ul>\n<p><b>[Compliance considerations]<\/b><\/p>\n<p>No compliance considerations identified. Review as appropriate for your organization.<\/p>\n<\/td>\n<\/tr>\n<tr>\n<th>Machine Translation<\/th>\n<td>\n<p><b>[\u306f\u3058\u3081\u306b]<\/b><\/p>\n<p>Microsoft\u306f<i>\u65b0\u3057\u3044Outlook for Windows<\/i>\u306eCopilot\u30b5\u30a4\u30c9\u30da\u30a4\u30f3\u306b<b>Copilot\u30a2\u30ab\u30a6\u30f3\u30c8\u5207\u308a\u66ff\u3048<\/b>\u6a5f\u80fd\u3092\u5c0e\u5165\u3057\u307e\u3059\u3002\u30a2\u30ab\u30a6\u30f3\u30c8\u5207\u308a\u66ff\u3048\u306f\u30a2\u30af\u30c6\u30a3\u30d6\u306aCopilot\u6709\u52b9\u30a2\u30ab\u30a6\u30f3\u30c8\u3092\u8868\u793a\u3057\u3001\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u305f\u4f53\u9a13\u3067\u30b5\u30a4\u30c9\u30da\u30a4\u30f3\u3067\u4f7f\u308f\u308c\u3066\u3044\u308bCopilot\u30a2\u30ab\u30a6\u30f3\u30c8\u3092\u30e6\u30fc\u30b6\u30fc\u304c\u5909\u66f4\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u306f <b>Microsoft 365\u30ed\u30fc\u30c9\u30de\u30c3\u30d7ID <a href=\"https:\/\/www.microsoft.com\/microsoft-365\/roadmap?filters=&amp;searchterms=559991\" target=\"_blank\">  559991<\/a><\/b>\u306b\u95a2\u9023\u4ed8\u3051\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><b>[\u3044\u3064\u8d77\u3053\u308b\u304b]<\/b><\/p>\n<ul>\n<li><b>\u30ea\u30ea\u30fc\u30b9\u4e88\u5b9a: <\/b>\u5c55\u958b\u306f<b> 2026\u5e744\u6708\u4e0b\u65ec <\/b>\u306b\u59cb\u307e\u308a\u3001 <b>2026\u5e745\u6708\u4e2d\u65ec<\/b>\u307e\u3067\u306b\u5b8c\u4e86\u3059\u308b\u4e88\u5b9a\u3067\u3059\u3002<\/li>\n<li><b>\u4e00\u822c\u516c\u958b(\u4e16\u754c\u5c55\u958b): <\/b>\u5c55\u958b\u306f <b>2026\u5e745\u6708\u4e2d\u65ec<\/b> \u306b\u958b\u59cb\u3055\u308c\u3001 <b>2026\u5e746\u6708\u4e2d\u65ec<\/b>\u307e\u3067\u306b\u5b8c\u4e86\u3059\u308b\u898b\u8fbc\u307f\u3067\u3059\u3002<\/li>\n<\/ul>\n<p><b>[\u3053\u308c\u304c\u3042\u306a\u305f\u306e\u7d44\u7e54\u306b\u4e0e\u3048\u308b\u5f71\u97ff]<\/b><\/p>\n<p><i>\u5f71\u97ff\u3092\u53d7\u3051\u308b\u4eba\u7269<\/i><\/p>\n<ul>\n<li>Microsoft 365\u30c6\u30ca\u30f3\u30c8\u306e\u30e6\u30fc\u30b6\u30fc\u3001<b>\u65b0\u3057\u3044Outlook for Windows<\/b>\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b<\/li>\n<li><i>Outlook<\/i>\u3067<b>\u8907\u6570\u306eCopilot\u5bfe\u5fdc\u30a2\u30ab\u30a6\u30f3\u30c8<\/b>\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u30e6\u30fc\u30b6\u30fc\u306e\u307f<\/li>\n<\/ul>\n<p><i>\u4f55\u304c\u8d77\u3053\u308b\u306e\u304b<\/i><\/p>\n<ul>\n<li><i>\u30b5\u30dd\u30fc\u30c8\u4f53\u9a13<\/i>\u3067\u306f\u3001<i><b>Copilot\u5074\u306e\u30da\u30a4\u30f3<\/b><\/i>\u4e0a\u90e8\u306b<b>\u65b0\u3057\u3044\u30a2\u30ab\u30a6\u30f3\u30c8\u30bb\u30ec\u30af\u30bf\u30fc<\/b>\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>\u30bb\u30ec\u30af\u30bf\u30fc\u306b\u306f\u73fe\u5728\u30a2\u30af\u30c6\u30a3\u30d6\u306aCopilot\u5bfe\u5fdc\u30a2\u30ab\u30a6\u30f3\u30c8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>\u30a2\u30ab\u30a6\u30f3\u30c8\u30bb\u30ec\u30af\u30bf\u30fc\u306f\u3001\u8907\u6570\u306eCopilot\u5bfe\u5fdc\u30a2\u30ab\u30a6\u30f3\u30c8\u304c\u5229\u7528\u53ef\u80fd\u3067\u3001\u30a2\u30ab\u30a6\u30f3\u30c8\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u304c\u66d6\u6627\u306a\u5834\u5408(\u4f8b\u3048\u3070\u7279\u5b9a\u306e\u30ab\u30ec\u30f3\u30c0\u30fc\u4f53\u9a13)\u5834\u5408\u306b\u306e\u307f\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>\u30e6\u30fc\u30b6\u30fc\u306fCopilot\u5074\u306e\u30da\u30a4\u30f3\u5185\u3067Copilot\u30a2\u30ab\u30a6\u30f3\u30c8\u3092\u5207\u308a\u66ff\u3048\u3001Outlook\u306e\u5e83\u3044\u30a2\u30ab\u30a6\u30f3\u30c8\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u5909\u66f4\u305b\u305a\u306b\u884c\u3048\u307e\u3059\u3002<\/li>\n<li>Mail\u3092\u4f7f\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u3001Copilot\u30a2\u30ab\u30a6\u30f3\u30c8\u5207\u308a\u66ff\u3048\u30c4\u30fc\u30eb\u304c\u8868\u793a\u3055\u308c\u307e\u305b\u3093\u3002&nbsp;<\/li>\n<li><b>\u5358\u4e00\u306eCopilot\u5bfe\u5fdc\u30a2\u30ab\u30a6\u30f3\u30c8\u3092\u6301\u3064\u30e6\u30fc\u30b6\u30fc\u306b\u306f\u5f71\u97ff\u306f\u3042\u308a\u307e\u305b\u3093<\/b>\u3002<\/li>\n<li>\u3053\u306e\u6a5f\u80fd\u306f <b>\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u6709\u52b9<\/b> \u5316\u3055\u308c\u3066\u304a\u308a\u3001\u65e2\u5b58\u306eCopilot\u306e\u5229\u7528\u53ef\u80fd\u6027\u3068\u30e9\u30a4\u30bb\u30f3\u30b9\u3092\u5c0a\u91cd\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<li>Copilot\u30a2\u30ab\u30a6\u30f3\u30c8\u5207\u308a\u66ff\u3048\u6a5f\u80fd\u306f <b>\u3001Microsoft 365 Copilot(\u30d7\u30ec\u30df\u30a2\u30e0)\u304a\u3088\u3073Copilot Chat(\u30d9\u30fc\u30b7\u30c3\u30af)\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u5229\u7528\u53ef\u80fd\u3067\u3059<\/b>\u3002<\/li>\n<li>\u3053\u308c\u306f\u30de\u30eb\u30c1\u30a2\u30ab\u30a6\u30f3\u30c8\u6a5f\u80fd\u3067\u3001 <b>\u5c11\u306a\u304f\u3068\u30822\u3064\u306eCopilot\u5bfe\u5fdc\u30a2\u30ab\u30a6\u30f3\u30c8\u304c\u5fc5\u8981\u3067\u3059<\/b>\u3002Premium\u307e\u305f\u306fBasic\u306e\u7d44\u307f\u5408\u308f\u305b\u306f\u4efb\u610f\u3067\u3059\u3002<\/li>\n<\/ul>\n<p><b>\u3010\u6e96\u5099\u306e\u305f\u3081\u306b\u3067\u304d\u308b\u3053\u3068\u3011<\/b><\/p>\n<p>\u4f55\u306e\u5bfe\u5fdc\u3082\u5fc5\u8981\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u30e6\u30fc\u30b6\u30fc\u8cea\u554f\u306b\u5099\u3048\u308b\u305f\u3081\u3001\u7ba1\u7406\u8005\u306b\u306f\u4ee5\u4e0b\u306e\u3053\u3068\u3092\u63a8\u5968\u3057\u307e\u3059:<\/p>\n<ul>\n<li><i>\u8907\u6570\u30a2\u30ab\u30a6\u30f3\u30c8<\/i>\u30b7\u30ca\u30ea\u30aa\u3067\u306eCopilot\u4f7f\u7528\u306b\u95a2\u3059\u308b\u5185\u90e8\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u66f4\u65b0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u8907\u6570\u306e\u30a2\u30ab\u30a6\u30f3\u30c8\u3092\u307e\u305f\u304c\u3063\u3066\u50cd\u304f\u30e6\u30fc\u30b6\u30fc\u306b\u3001 <i>Copilot\u30b5\u30a4\u30c9\u30da\u30a4\u30f3<\/i>\u3067\u30a2\u30af\u30c6\u30a3\u30d6\u306aCopilot\u30a2\u30ab\u30a6\u30f3\u30c8\u306e\u78ba\u8a8d\u3084\u5909\u66f4\u65b9\u6cd5\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u8907\u6570\u306eOutlook\u30a2\u30ab\u30a6\u30f3\u30c8\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u30e6\u30fc\u30b6\u30fc\u5411\u3051\u306e\u30d8\u30eb\u30d7\u30c7\u30b9\u30af\u30ac\u30a4\u30c0\u30f3\u30b9\u3092\u66f4\u65b0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ul>\n<p><b>[\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u306e\u8003\u616e\u4e8b\u9805]<\/b><\/p>\n<p>\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u4e0a\u306e\u8003\u616e\u4e8b\u9805\u306f\u7279\u5b9a\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u7d44\u7e54\u306b\u5fdc\u3058\u305f\u9069\u5207\u306a\u30ec\u30d3\u30e5\u30fc\u3092\u884c\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>MC1290822 | Microsoft Outlook: Copilot account switcher in the Outlook side pane Classification planForChange  [&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-16118","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/16118","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=16118"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/16118\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=16118"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=16118"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=16118"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}