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Microsoft is working to address a widespread service issue affecting the mail flow pipeline for Exchange Online customers across North America and Germany. [...]
Microsoft says it will start blocking legacy TLS connections for POP and IMAP email clients in Exchange Online starting in July 2026. [...]
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. [...]
Microsoft announced today that it has canceled plans to impose a daily limit of 2,000 external recipients on Exchange Online bulk email senders. [...]
Microsoft announced on Monday that it will soon block mobile devices running outdated email software from accessing Exchange Online services until they're updated. [...]
Microsoft is enabling threshold-based auto-archiving by default in Exchange Online to prevent email flow issues caused by mailboxes filling up faster than expected. [...]
Microsoft is investigating a known issue that causes the classic Outlook email client to crash upon launch, which can only be resolved via Exchange Online support. [...]
Microsoft is working to resolve an Exchange Online issue causing email access problems for Outlook mobile users who use Hybrid Modern Authentication (HMA). [...]
Microsoft says its Defender for Office 365 cloud-based email security suite will now automatically detect and block email bombing attacks. [...]
Microsoft says it partially mitigated a week-long Exchange Online outage causing delays or failures when sending or receiving email messages. [...]
Hewlett Packard Enterprise (HPE) is notifying employees whose data was stolen from the company's Office 365 email environment by Russian state-sponsored hackers in a May 2023 cyberattack. [...]
Microsoft announced today that inbound SMTP DANE with DNSSEC for Exchange Online, a new capability to boost email security and integrity, is now generally available. [...]
Microsoft has announced plans to fight spam by imposing a daily Exchange Online bulk email limit of 2,000 external recipients starting January 2025. [...]
Microsoft confirmed that the Russian Foreign Intelligence Service hacking group, which hacked into its executives' email accounts in November 2023, also breached other organizations as part of this malicious campaign. [...]
Hewlett Packard Enterprise (HPE) disclosed today that suspected Russian hackers known as Midnight Blizzard gained access to the company's Microsoft Office 365 email environment to steal data from its cybersecurity team and other departments. [...]
Security researchers at WithSecure have discovered it's possible to partially or fully infer the contents of encrypted messages sent through Microsoft Office 365, highlighting an intrinsic weakness in the encryption scheme used. [...]
CISA has urged government agencies and private sector organizations using Microsoft's Exchange cloud email platform to expedite the switch from Basic Authentication legacy authentication methods without multifactor authentication (MFA) support to Modern Authentication alternatives. [...]
Office 365 and Azure Active Directory (Azure AD) customers were the targets of billions of phishing emails and brute force attacks successfully blocked last year by Microsoft. [...]
Microsoft has added SMTP MTA Strict Transport Security (MTA-STS) support to Exchange Online to ensure Office 365 customers' email communication integrity and security. [...]