{"id":15999,"date":"2026-04-17T11:01:15","date_gmt":"2026-04-17T02:01:15","guid":{"rendered":"https:\/\/m365jp.net\/?p=15999"},"modified":"2026-04-17T11:06:14","modified_gmt":"2026-04-17T02:06:14","slug":"servicedegradation-ex1275040-exchange-online-users-may-be-unable-to-download-or-open-email-attachments-in-outlook-on-the-web-10","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-04-17-servicedegradation-ex1275040-exchange-online-users-may-be-unable-to-download-or-open-email-attachments-in-outlook-on-the-web-10","title":{"rendered":"[serviceDegradation] EX1275040 | Exchange Online | Users may be unable to download or open email attachments in Outlook on the web"},"content":{"rendered":"
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EX1275040 | Exchange Online | Users may be unable to download or open email attachments in Outlook on the web<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceDegradation<\/td>\n<\/tr>\n
Classification<\/th>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers may be unable to download or open email attachments in Outlook on the web.<\/td>\n<\/tr>\n
Last Updated<\/th>\n04\/17\/2026 01:56:23<\/td>\n<\/tr>\n
Start Time<\/th>\n04\/09\/2026 04:00:00<\/td>\n<\/tr>\n
End Time<\/th>\n<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Users may be unable to download or open email attachments in Outlook on the web<\/p>\n

User impact: Users may be unable to download or open email attachments in Outlook on the web.<\/p>\n

Current status: We’ve identified an authentication issue on a portion of Outlook on the web infrastructure responsible for downloading and opening attachments is resulting in impact. We’re restarting the affected portion of infrastructure to remediate impact, and we’re monitoring telemetry to ensure the issue is resolved, or to identify if any additional remediation actions may be needed.<\/p>\n

Scope of impact: Some users attempting to download or open email attachments in Outlook on the web may be impacted. This information may be updated as our investigation continues.<\/p>\n

Start time: Thursday, April 9, 2026, at 4:00 AM UTC<\/p>\n

Root cause: An authentication issue on a portion of Outlook on the web infrastructure responsible for downloading and opening attachments is resulting in impact. <\/p>\n

Next update by: Friday, April 17, 2026, at 5:00 AM UTC<\/td>\n<\/tr>\n

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EX1275040 | Exchange Online | Users may be unable to download or open email attachments in Outlook on the web […]<\/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-15999","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15999","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=15999"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/15999\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=15999"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=15999"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=15999"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}