Microsoft Exchange Online Mailbox Access Outage Affects Users Globally
ID: 7d2e7b53-67fc-5e8f-995d-714f3aa8b51e
STIX ID: report--7d2e7b53-67fc-5e8f-995d-714f3aa8b51e
Feed Name: cybersecurityNews.com
Microsoft reported an Exchange Online service disruption on March 16, 2026 that caused some users to be unable to access mailboxes via Outlook (desktop/mobile), Outlook on the Web, and other clients; engineering teams are investigating and issuing Service Health updates while administrators are advised to monitor the Microsoft 365 admin center and apply temporary workarounds as needed.
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