{"id":14159,"date":"2025-12-06T07:00:48","date_gmt":"2025-12-05T22:00:48","guid":{"rendered":"https:\/\/m365jp.net\/?p=14159"},"modified":"2025-12-06T07:03:55","modified_gmt":"2025-12-05T22:03:55","slug":"servicerestored-ex1189359-exchange-online-users-may-be-unable-to-open-excel-files-attached-to-email-messages-in-new-outlook-and-receive-an-error","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2025-12-06-servicerestored-ex1189359-exchange-online-users-may-be-unable-to-open-excel-files-attached-to-email-messages-in-new-outlook-and-receive-an-error","title":{"rendered":"[serviceRestored] EX1189359 | Exchange Online | Users may be unable to open Excel files attached to email messages in new Outlook and receive an error"},"content":{"rendered":"
\n
\n
\n\n\n\n
EX1189359 | Exchange Online | Users may be unable to open Excel files attached to email messages in new Outlook and receive an error<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n\n\n\n\n\n\n\n\n\n\n
Status<\/th>\nserviceRestored<\/td>\n<\/tr>\n
Classification<\/th>\nadvisory<\/td>\n<\/tr>\n
User Impact<\/th>\nUsers may have been unable to open Excel files attached to email messages in new Outlook and received an error.<\/td>\n<\/tr>\n
Last Updated<\/th>\n12\/05\/2025 21:07:48<\/td>\n<\/tr>\n
Start Time<\/th>\n11\/14\/2025 20:00:00<\/td>\n<\/tr>\n
End Time<\/th>\n12\/05\/2025 18:00:00<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Users may be unable to open Excel files attached to email messages in new Outlook and receive an error<\/p>\n

User impact: Users may have been unable to open Excel files attached to email messages in new Outlook and received an error.<\/p>\n

More info: Users received an error stating: “Try opening the file again later.”<\/p>\n

This issue impacted attachments that contained non-ASCII characters. As a way to avoid impact, users with access to Outlook on the web could have used this to bypass the impact or downloaded the file locally to manually open Excel files.<\/p>\n

Final status: We’ve confirmed that our deployment finished saturating and is now available in the newest version upgrade, 20251128003.06. We’ve also verified through final customer testing that impact is fully remediated once users upgrade their Outlook clients to version 20251128003.06.<\/p>\n

Scope of impact: Any user may have been unable to open Excel files attached to email messages in the new Outlook client if the attachment contained non-ASCII characters.<\/p>\n

Start time: Friday, November 14, 2025, at 8:00 PM UTC<\/p>\n

End time: Friday, December 5, 2025, at 6:00 PM UTC<\/p>\n

Root cause: A recent change to update how attachments are cached introduced an encoding error within Excel file names which was causing non-ASCII characters to fail, and this resulted in impact.<\/p>\n

Next steps:
– We’re continuing to review and improve our code change processes to better detect and prevent similar service incidents from occurring in the future.<\/p>\n

This is the final update for the event.<\/td>\n<\/tr>\n

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb:\u30e6\u30fc\u30b6\u30fc\u304c\u65b0\u3057\u3044Outlook\u3067\u30e1\u30fc\u30eb\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u6dfb\u4ed8\u3055\u308c\u305fExcel\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3051\u305a\u3001\u30a8\u30e9\u30fc\u304c\u51fa\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059<\/p>\n

\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u5f71\u97ff:\u30e6\u30fc\u30b6\u30fc\u306f\u65b0\u3057\u3044Outlook\u3067\u30e1\u30fc\u30eb\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u6dfb\u4ed8\u3055\u308c\u305fExcel\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3051\u305a\u3001\u30a8\u30e9\u30fc\u304c\u51fa\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u8ffd\u52a0\u60c5\u5831:\u30e6\u30fc\u30b6\u30fc\u306b\u300c\u5f8c\u3067\u518d\u5ea6\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3044\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u300d\u3068\u3044\u3046\u30a8\u30e9\u30fc\u304c\u51fa\u307e\u3057\u305f\u3002<\/p>\n

\u3053\u306e\u554f\u984c\u306fASCII\u4ee5\u5916\u306e\u6587\u5b57\u3092\u542b\u3080\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u306b\u5f71\u97ff\u3092\u53ca\u307c\u3057\u307e\u3057\u305f\u3002\u5f71\u97ff\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u3001\u30a6\u30a7\u30d6\u4e0a\u306eOutlook\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u30e6\u30fc\u30b6\u30fc\u306f\u3053\u308c\u3092\u4f7f\u3063\u3066\u5f71\u97ff\u3092\u56de\u907f\u3059\u308b\u304b\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u30ed\u30fc\u30ab\u30eb\u306b\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u3066\u624b\u52d5\u3067Excel\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304f\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n

\u6700\u7d42\u72b6\u6cc1:\u79c1\u305f\u3061\u306e\u5c55\u958b\u306f\u98fd\u548c\u72b6\u614b\u3092\u7d42\u3048\u3001\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3067\u3042\u308b20251128003.06\u3067\u5229\u7528\u53ef\u80fd\u3067\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002\u307e\u305f\u3001\u6700\u7d42\u7684\u306a\u9867\u5ba2\u30c6\u30b9\u30c8\u3067\u3001\u30e6\u30fc\u30b6\u30fc\u304cOutlook\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092\u30d0\u30fc\u30b8\u30e7\u30f320251128003.06\u306b\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3059\u308c\u3070\u3001\u5f71\u97ff\u304c\u5b8c\u5168\u306b\u56de\u5fa9\u3055\u308c\u308b\u3053\u3068\u3082\u78ba\u8a8d\u3057\u307e\u3057\u305f\u3002<\/p>\n

\u5f71\u97ff\u7bc4\u56f2:\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u306bASCII\u6587\u5b57\u4ee5\u5916\u306e\u6587\u5b57\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u65b0\u3057\u3044Outlook\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067\u30e1\u30fc\u30eb\u306b\u6dfb\u4ed8\u3055\u308c\u305fExcel\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3051\u306a\u304b\u3063\u305f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u958b\u59cb\u6642\u9593:2025\u5e7411\u670814\u65e5\u91d1\u66dc\u65e5 \u5348\u5f8c8\u6642 UTC<\/p>\n

\u7d42\u4e86\u6642\u523b:2025\u5e7412\u67085\u65e5\u91d1\u66dc\u65e5 \u5348\u5f8c6\u6642 UTC<\/p>\n

\u6839\u672c\u539f\u56e0:\u6700\u8fd1\u306e\u6dfb\u4ed8\u30d5\u30a1\u30a4\u30eb\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u65b9\u6cd5\u306e\u5909\u66f4\u306b\u3088\u308a\u3001Excel\u30d5\u30a1\u30a4\u30eb\u540d\u5185\u306b\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3001\u975eASCII\u6587\u5b57\u304c\u5931\u6557\u3057\u3001\u5f71\u97ff\u304c\u51fa\u307e\u3057\u305f\u3002<\/p>\n

\u6b21\u306e\u30b9\u30c6\u30c3\u30d7:
– \u4eca\u5f8c\u3082\u540c\u69d8\u306e\u30b5\u30fc\u30d3\u30b9\u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u304c\u518d\u767a\u3057\u306a\u3044\u3088\u3046\u306b\u3001\u30b3\u30fc\u30c9\u5909\u66f4\u30d7\u30ed\u30bb\u30b9\u306e\u898b\u76f4\u3057\u3068\u6539\u5584\u3092\u7d99\u7d9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u3053\u308c\u304c\u30a4\u30d9\u30f3\u30c8\u306e\u6700\u7d42\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3067\u3059\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

EX1189359 | Exchange Online | Users may be unable to open Excel files attached to email messages in new Outloo […]<\/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-14159","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14159","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=14159"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14159\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=14159"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=14159"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=14159"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}