{"id":15409,"date":"2026-03-17T08:02:36","date_gmt":"2026-03-16T23:02:36","guid":{"rendered":"https:\/\/m365jp.net\/?p=15409"},"modified":"2026-03-17T08:03:12","modified_gmt":"2026-03-16T23:03:12","slug":"mc1253750-microsoft-365-copilot-upload-local-files-now-supports-eml-and-msg-file-types","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-03-17-mc1253750-microsoft-365-copilot-upload-local-files-now-supports-eml-and-msg-file-types","title":{"rendered":"MC1253750 | Microsoft 365 Copilot: Upload local files now supports .eml and .msg file types"},"content":{"rendered":"<div class=\"postie-post\">\n<div>\n<hr>\n<table id=\"section\">\n<tbody>\n<tr>\n<th width=\"95%\">MC1253750 | Microsoft 365 Copilot: Upload local files now supports .eml and .msg file types<\/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>03\/16\/2026 22:32:05<\/td>\n<\/tr>\n<tr>\n<th>Start Time<\/th>\n<td>03\/16\/2026 22:31:42<\/td>\n<\/tr>\n<tr>\n<th>End Time<\/th>\n<td>04\/21\/2026 07:00:00<\/td>\n<\/tr>\n<tr>\n<th>Message Content<\/th>\n<td>\n<p><b>[Introduction]<\/b><\/p>\n<p>We\u2019re adding <b>support for .eml and .msg file uploads<\/b> in<i> Microsoft 365 Copilot<\/i>, including  <b>Copilot Chat<\/b> and the <b>Microsoft 365 Copilot app<\/b>. This update makes it easier for users to include email files as context when prompting Copilot, helping them generate more relevant and grounded responses.<\/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=552591#Roadmap\" target=\"_blank\">  552591<\/a><\/b>.<\/p>\n<p><b>[When this will happen]<\/b><\/p>\n<ul>\n<li><b>General availability (Worldwide): <\/b>Rollout begin in<b> late February 2026<\/b> and is expected to complete by<b> late March 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>All users in<i> Microsoft 365 tenants <\/i>who have access to <b>Microsoft 365 Copilot Chat  <\/b>or the <b>Microsoft 365 Copilot app<\/b>.<\/li>\n<\/ul>\n<p><i>What will happen<\/i><\/p>\n<ul>\n<li>Users will be able to upload .eml and .msg files directly when interacting with Copilot.<\/li>\n<li>Uploaded files can be used<b> as grounding context for prompts<\/b>.<\/li>\n<li>This feature is <b>available by default;<\/b> no admin configuration is required.<\/li>\n<li>There is no change to existing policies governing file handling or data access.<\/li>\n<\/ul>\n<p><b>[What you can do to prepare]<\/b><\/p>\n<p>No action is required. This feature will roll out automatically.<\/p>\n<p>Optionally, you may:<\/p>\n<ul>\n<li>Inform helpdesk or support staff in case users ask about new upload capabilities.<\/li>\n<li>Update internal Copilot usage or prompt\u2011writing guidance to reflect expanded supported file types.<\/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><i>Microsoft 365 Copilot<\/i>\u3067\u306f\u3001<b>Copilot<\/b>\u30c1\u30e3\u30c3\u30c8\u3084<b>Microsoft 365 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| Microsoft 365 Copilot: Upload local files now supports .eml and .msg file types Classification sta 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