
マイクロソフトは根本原因への対処を完了し、一部地域での復旧作業を継続
マイクロソフト365の大規模障害が13日時点で復旧を進めており、70カ国以上に影響を及ぼした。同社は根本原因への対処を完了したと発表し、サイバー攻撃やAIの暴走ではないと説明した。
AI-generated summary
マイクロソフト365の大規模障害は、世界各国の公的機関や企業に影響を及ぼした。障害は過去の設備増強時に発生した問題が、直近のネットワーク変更で表面化したことが原因だった。
【シリコンバレー時事】世界各国の公的機関や企業に影響を及ぼした米マイクロソフト(MS)の業務用ソフト群「マイクロソフト365」の大規模障害は、13日時点で復旧が進んでいる。MSは13日午前(日本時間14日未明)、X(旧ツイッター)で「(障害の)根本原因には対処済みだ」と述べ、障害が継続している顧客や地域への対応や、復旧状況の確認作業を続けている。
マイクロソフト大規模障害、解消せず 一部回復も不具合続く、70カ国以上に影響か
MSによると、障害は過去に設備増強を行った際に発生した問題が、直近のネットワークの変更で表面化したことが原因だった。サイバー攻撃や人工知能(AI)の暴走によるものではないという。
MSは「今回の問題で顧客にもたらした混乱を深く謝罪する」と述べ、障害に関する調査が完了し次第、報告書を公表する方針を示した。
AI outlook — possibilities, not facts
マイクロソフトが障害に関する調査報告書を公表する
Likely · Within weeks

Microsoft announced that it has fully recovered from a large-scale failure in its business software "Microsoft 365." The outage occurred on the 12th, affecting services such as Outlook and Teams, and disrupted operations at public institutions and companies in more than 70 countries and regions around the world, including Japan's Government Solution Service (GSS). The cause was a change in the network after equipment reinforcement, and was not due to a cyber attack or AI going out of control.
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Among ITmedia Mobile's top 10 most accessed articles for the week from November 5th to November 11th, 2026, the number one article was NTT DoCoMo's 5G SA communication failure recovery report. The outage only affected 5G SA option subscribers, reaching up to approximately 1,587,000 lines (3-4% of Docomo 5G subscribers). A similar problem occurred on November 11th.
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The roaming agreement between KDDI and Rakuten Mobile ended on October 1st, and roaming in urban areas has been reduced. KDDI improved the packet stoppage rate in congested areas by 30%, and recorded an additional 10 billion yen in roaming revenue that was not in the full-year plan. Rakuten Mobile's user outflow was limited, and the churn rate decreased from 1.47% to 1.42%. Rakuten Economic Zone's pricing plans prevent users from leaving.
Amid a series of information leaks due to unauthorized access, 100 yen shop Daiso is running out of paper password management notebooks. Daiso Sangyo, which operates the product, is making adjustments to restock and increase production during November. While the Information-technology Promotion Agency (IPA) does not necessarily deny paper management, it points out the risks of loss, peeping, and leakage from the service side, and recommends setting up multi-factor authentication and passkeys.
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AI and high-tech companies such as OpenAI, Anthropic, and NVIDIA are ramping up their anti-espionage and other crisis responses and hiring former spies and intelligence professionals. Salary ranges from $200,000 to $500,000. NVIDIA announces CEO Jensen Huang's resignation. It has been pointed out that many companies ignore the risk of their top executives becoming targets of spies.

Due to a large-scale failure at Microsoft in the US, email and AI functions became unusable at local governments and medical institutions in Japan. Business operations have been disrupted in Kumamoto City, Osaka City, and medical institutions, and with no prospect of recovery in sight, confusion is spreading, including switching to telephone support.