{"id":14804,"date":"2026-02-04T04:01:04","date_gmt":"2026-02-03T19:01:04","guid":{"rendered":"https:\/\/m365jp.net\/?p=14804"},"modified":"2026-02-04T04:06:56","modified_gmt":"2026-02-03T19:06:56","slug":"servicerestored-ex1226468-exchange-online-group-owners-may-be-unable-to-modify-group-memberships-in-the-global-address-book-in-the-classic-outlook-desktop-client","status":"publish","type":"post","link":"https:\/\/m365jp.net\/index.php\/2026-02-04-servicerestored-ex1226468-exchange-online-group-owners-may-be-unable-to-modify-group-memberships-in-the-global-address-book-in-the-classic-outlook-desktop-client","title":{"rendered":"[serviceRestored] EX1226468 | Exchange Online | Group owners may be unable to modify group memberships in the Global Address Book in the classic Outlook desktop client"},"content":{"rendered":"
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EX1226468 | Exchange Online | Group owners may be unable to modify group memberships in the Global Address Book in the classic Outlook desktop client<\/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>\nGroup owners were unable to modify group memberships in the Global Address Book in the classic Outlook desktop client.<\/td>\n<\/tr>\n
Last Updated<\/th>\n02\/03\/2026 18:29:34<\/td>\n<\/tr>\n
Start Time<\/th>\n02\/03\/2026 00:15:00<\/td>\n<\/tr>\n
End Time<\/th>\n02\/03\/2026 17:29:00<\/td>\n<\/tr>\n
Latest Message<\/th>\nTitle: Group owners may be unable to modify group memberships in the Global Address Book in the classic Outlook desktop client<\/p>\n

User impact: Group owners were unable to modify group memberships in the Global Address Book in the classic Outlook desktop client.<\/p>\n

More info: Distribution Groups may have been able to be modified, but Security Groups may have been affected.<\/p>\n

While we worked towards mitigation, affected users may have been able to utilize the new Outlook desktop client or Outlook on the web to perform Distribution Group modifications.<\/p>\n

Final status: We’ve identified that a recent feature change intended to enable the use of a new API for managing distribution group modifications introduced an issue resulting in impact. We’ve reverted the affecting change and confirmed that impact was successfully remediated.<\/p>\n

Scope of impact: This issue may have affected all group owners modifying certain group memberships through the Outlook Address Book in the classis Outlook desktop client.<\/p>\n

Start time: Tuesday, February 3, 2026, at 12:15 AM UTC<\/p>\n

End time: Tuesday, February 3, 2026, at 5:29 PM UTC<\/p>\n

Root cause: A recent feature change intended to enable the use of a new API for managing distribution group modifications introduced an issue resulting in impact.<\/p>\n

Next steps:
– We’re reviewing the affecting change to understand why it resulted in impact to better prevent similar future occurrences.<\/p>\n

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

Machine Translation<\/th>\n\u30bf\u30a4\u30c8\u30eb:\u30b0\u30eb\u30fc\u30d7\u6240\u6709\u8005\u306f\u3001\u30af\u30e9\u30b7\u30c3\u30af\u306aOutlook\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u30b0\u30ed\u30fc\u30d0\u30eb\u30a2\u30c9\u30ec\u30b9\u30d6\u30c3\u30af\u3067\u30b0\u30eb\u30fc\u30d7\u30e1\u30f3\u30d0\u30fc\u30b7\u30c3\u30d7\u3092\u5909\u66f4\u3067\u304d\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059<\/p>\n

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\u958b\u59cb\u6642\u9593:2026\u5e742\u67083\u65e5\u706b\u66dc\u65e5 0:15 UTC<\/p>\n

\u7d42\u4e86\u6642\u523b:2026\u5e742\u67083\u65e5\u706b\u66dc\u65e5 17:29 UTC<\/p>\n

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\u6b21\u306e\u30b9\u30c6\u30c3\u30d7:
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EX1226468 | Exchange Online | Group owners may be unable to modify group memberships in the Global Address Boo […]<\/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-14804","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14804","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=14804"}],"version-history":[{"count":0,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/posts\/14804\/revisions"}],"wp:attachment":[{"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/media?parent=14804"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/categories?post=14804"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m365jp.net\/index.php\/wp-json\/wp\/v2\/tags?post=14804"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}