Exchange Online
Microsoft to deprecate legacy TLS in Exchange Online starting July
Microsoft says it will start blocking legacy TLS connections for POP and IMAP email clients in Exchange Online starting in July 2026. The Transport Layer Security (TLS) cryptographic protocol protects users’ information from eavesdropping, tampering, and message forgery when accessing email over the Internet via client/server applications. However, the original TLS 1.0 specification and its […]
Microsoft still working to fix Exchange Online mailbox access issues
Microsoft is investigating and working to resolve Exchange Online mailbox access issues that have intermittently affected Outlook mobile and macOS users for weeks. When it first acknowledged this service issue (tracked under EX1256020) last week, Microsoft said the root cause was a newly introduced virtual account. While the company flagged it as resolved on April 1, […]
Microsoft Exchange Online service change causes email access issues
Microsoft is working to address an ongoing service issue that has intermittently prevented some users from accessing their cloud-based Exchange Online mailboxes via Outlook mobile and Mac desktop clients since Thursday. After investigating the incident (tracked under EX1256020), Microsoft found that the root cause was a newly introduced virtual account. On Saturday, began working to revert […]
Microsoft Exchange Online outage blocks access to mailboxes
Microsoft is working to address an ongoing Exchange Online outage that is preventing customers from accessing their mailboxes and calendars. “We’re investigating reports of some users experiencing issues when accessing their Exchange Online mailbox via one or more connection methods,” Microsoft said when it acknowledged the issue at 06:42 AM UTC. As Microsoft explained in a Microsoft […]
Microsoft: Anti-phishing rules mistakenly blocked emails, Teams messages
Microsoft says an Exchange Online issue that mistakenly quarantined legitimate emails last week was triggered by faulty heuristic detection rules designed to block credential phishing campaigns. As Microsoft explains in a preliminary post-incident report published this week, a software error in its email security system incorrectly flagged thousands of legitimate URLs as phishing links for nearly a week, […]
Microsoft: Exchange Online flags legitimate emails as phishing
Microsoft is investigating an ongoing Exchange Online issue that mistakenly flags legitimate emails as phishing and quarantines them. The incident began on February 5 and continues to affect Exchange Online customers, preventing them from sending or receiving emails. “Some users’ legitimate email messages are being marked as phish and quarantined in Exchange Online,” Microsoft said in […]
Microsoft to shut down Exchange Online EWS in April 2027
Microsoft announced today that the Exchange Web Services (EWS) API for Exchange Online will be shut down in April 2027, after nearly 20 years. EWS is a cross-platform API for developing apps that can access Exchange mailbox items, such as email messages, meetings, and contacts, retrieved from various sources, including Exchange Online and on-premises editions […]
Microsoft: Outlook for iOS crashes, freezes due to coding error
Microsoft confirmed today that Outlook mobile may crash or freeze when launched on iPad devices due to a coding error. While this known issue may affect all users of Outlook for iOS version 5.2602.0 on an iPad, Microsoft says that they can work around it by launching Outlook after enabling Airplane Mode. “The latest Outlook […]
Microsoft Exchange Online outage blocks access to mailboxes via IMAP4
Microsoft is working to fix an Exchange Online service outage that intermittently prevents users from accessing their mailboxes via the Internet Mailbox Access Protocol 4 (IMAP4). The incident (tracked under EX1215307) began on January 1st at 19:00 UTC, with Microsoft noting that other connection methods are not affected and advising those impacted that retries may help […]
Microsoft cancels plans to rate limit Exchange Online bulk emails
Microsoft announced today that it has canceled plans to impose a daily limit of 2,000 external recipients on Exchange Online bulk email senders. The change was announced in April 2024, when Microsoft said that it would add new External Recipient Rate (ERR) limits starting January 2025 to fight spam, with plans to begin enforcing the limit on […]