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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. [...]
12:10 pm, April 3, 2026
guid
https://www.bleepingcomputer.com/news/microsoft/microsoft-still-working-to-fix-exchange-online-mailbox-access-issues/
source_url
https://www.bleepingcomputer.com/news/microsoft/microsoft-still-working-to-fix-exchange-online-mailbox-access-issues/
author_name
Sergiu Gatlan
id: 491
uid: 1ED9u
insdate: 2026-04-03 12:10:07
title: Microsoft still working to fix Exchange Online mailbox access issues
additional: Microsoft is investigating and working to resolve Exchange Online mailbox access issues that have intermittently affected Outlook mobile and macOS users for weeks. [...]
category: Cybersecurity
md5:
guid: https://www.bleepingcomputer.com/news/microsoft/microsoft-still-working-to-fix-exchange-online-mailbox-access-issues/
source_url: https://www.bleepingcomputer.com/news/microsoft/microsoft-still-working-to-fix-exchange-online-mailbox-access-issues/
updated:
image:
author_name: Sergiu Gatlan
author_link:
uid: 1ED9u
insdate: 2026-04-03 12:10:07
title: Microsoft still working to fix Exchange Online mailbox access issues
additional: Microsoft is investigating and working to resolve Exchange Online mailbox access issues that have intermittently affected Outlook mobile and macOS users for weeks. [...]
category: Cybersecurity
md5:
guid: https://www.bleepingcomputer.com/news/microsoft/microsoft-still-working-to-fix-exchange-online-mailbox-access-issues/
source_url: https://www.bleepingcomputer.com/news/microsoft/microsoft-still-working-to-fix-exchange-online-mailbox-access-issues/
updated:
image:
author_name: Sergiu Gatlan
author_link:
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- Marimo RCE Flaw CVE-2026-39987 Exploited Within 10 Hours of Disclosure
- Marquis: Ransomware gang stole data of 672K people in cyberattack
- Masjesu Botnet Emerges as DDoS-for-Hire Service Targeting Global IoT Devices
- Masters of Imitation: How Hackers and Art Forgers Perfect the Art of Deception
- Max severity Flowise RCE vulnerability now exploited in attacks
- Max severity Ubiquiti UniFi flaw may allow account takeover
- Mazda discloses security breach exposing employee and partner data
- Medtech giant Stryker fully operational after data-wiping attack
- Medtech giant Stryker offline after Iran-linked wiper malware attack
- Meta Disables 150K Accounts Linked to Southeast Asia Scam Centers in Global Crackdown
- Meta adds new WhatsApp, Facebook, and Messenger anti-scam tools
- Meta to Shut Down Instagram End-to-End Encrypted Chat Support Starting May 2026
- Microsoft 365 Backup to add file-level restore for faster recovery
- Microsoft Azure Monitor alerts abused for callback phishing attacks
- Microsoft Azure Monitor alerts abused in callback phishing campaigns
- Microsoft Details Cookie-Controlled PHP Web Shells Persisting via Cron on Linux Servers
- Microsoft Exchange Online outage blocks access to mailboxes
- Microsoft Exchange Online service change causes email access issues
- Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
- Microsoft Patch Tuesday March 2026, (Tue, Mar 10th)
- Microsoft Patch Tuesday, March 2026 Edition
- Microsoft Patches 84 Flaws in March Patch Tuesday, Including Two Public Zero-Days
- Microsoft Reveals ClickFix Campaign Using Windows Terminal to Deploy Lumma Stealer
- Microsoft Teams phishing targets employees with A0Backdoor malware
- Microsoft Teams phishing targets employees with backdoors
- Microsoft Teams will tag third-party bots trying to join meetings
- Microsoft Warns IRS Phishing Hits 29,000 Users, Deploys RMM Malware
- Microsoft Warns OAuth Redirect Abuse Delivers Malware to Government Targets
- Microsoft Warns of WhatsApp-Delivered VBS Malware Hijacking Windows via UAC Bypass
- Microsoft brings phishing-resistant Windows sign-ins via Entra passkeys
- Microsoft fixes Classic Outlook bug causing email delivery issues
- Microsoft fixes Outlook Classic crashes caused by Teams Meeting add-in
- Microsoft fixes bug causing Classic Outlook sync issues with Gmail
- Microsoft investigates classic Outlook sync and connection issues
- Microsoft links Classic Outlook issue to email delivery problems
- Microsoft links Medusa ransomware affiliate to zero-day attacks
- Microsoft now force upgrades unmanaged Windows 11 24H2 PCs
- Microsoft pulls KB5079391 Windows update over install issues
- Microsoft pulls Samsung app blocking Windows C: drive from Store
- Microsoft releases Windows 10 KB5078885 extended security update
- Microsoft releases Windows 11 OOB hotpatch to fix RRAS RCE flaw
- Microsoft removes Support and Recovery Assistant from Windows
- Microsoft rolls out fix for broken Windows Start Menu search
- Microsoft shares fix for Windows C: drive access issues on Samsung PCs
- Microsoft still working to fix Exchange Online mailbox access issues
- Microsoft still working to fix Windows Explorer white flashes
- Microsoft stops force-installing the Microsoft 365 Copilot app
- Microsoft suspends dev accounts for high-profile open source projects
- Microsoft to enable Windows hotpatch security updates by default
- Microsoft: Canadian employees targeted in payroll pirate attacks
- Microsoft: Enabling Teams Meeting add-in breaks Outlook Classic
- Microsoft: Hackers abuse OAuth error flows to spread malware
- Microsoft: Hackers abusing AI at every stage of cyberattacks
- Microsoft: March Windows updates break Teams, OneDrive sign-ins
- Microsoft: Windows 11 users can't access C: drive on some Samsung PCs
- Mirax Android RAT Turns Devices into SOCKS5 Proxies, Reaching 220,000 via Meta Ads
- Mississippi medical center reopens clinics hit by ransomware attack
- More Honeypot Fingerprinting Scans, (Wed, Apr 8th)
- Multi-OS Cyberattacks: How SOCs Close a Critical Risk in 3 Steps
- Multi-Stage VOID#GEIST Malware Delivering XWorm, AsyncRAT, and Xeno RAT
- Musician admits to $10M streaming royalty fraud using AI bots
- N. Korean Hackers Spread 1,700 Malicious Packages Across npm, PyPI, Go, Rust
- Navia discloses data breach impacting 2.7 million people
- Nearly 4,000 US industrial devices exposed to Iranian cyberattacks
- New "LeakyLooker" Flaws in Google Looker Studio Could Enable Cross-Tenant SQL Queries
- New 'Zombie ZIP' technique lets malware slip past security tools
- New BeatBanker Android malware poses as Starlink app to hijack devices
- New Booking.com data breach forces reservation PIN resets
- New Chaos Variant Targets Misconfigured Cloud Deployments, Adds SOCKS Proxy
- New Chrome Vulnerability Let Malicious Extensions Escalate Privileges via Gemini Panel
- New Chrome Zero-Day CVE-2026-5281 Under Active Exploitation — Patch Released
- New CrystalRAT malware adds RAT, stealer and prankware features
- New EvilTokens service fuels Microsoft device code phishing attacks
- New FortiClient EMS flaw exploited in attacks, emergency patch released
- New GPUBreach Attack Enables Full CPU Privilege Escalation via GDDR6 Bit-Flips
- New GPUBreach attack enables system takeover via GPU rowhammer
- New Infinity Stealer malware grabs macOS data via ClickFix lures
- New KB5085516 emergency update fixes Microsoft account sign-in
- New KadNap botnet hijacks ASUS routers to fuel cybercrime proxy network
- New Perseus Android Banking Malware Monitors Notes Apps to Extract Sensitive Data
- New PhantomRaven NPM attack wave steals dev data via 88 packages
- New Progress ShareFile flaws can be chained in pre-auth RCE attacks
- New RFP Template for AI Usage Control and AI Governance
- New RoadK1ll WebSocket implant used to pivot on breached networks
- New SparkCat Variant in iOS, Android Apps Steals Crypto Wallet Recovery Phrase Images
- New Torg Grabber infostealer malware targets 728 crypto wallets
- New VENOM phishing attacks steal senior executives' Microsoft logins
- New Windows 11 emergency update fixes preview update install issues
- New Windows 11 hotpatch fixes Bluetooth device visibility issue
- New font-rendering trick hides malicious commands from AI tools
- New macOS stealer campaign uses Script Editor in ClickFix attack
- New ‘BlackSanta’ EDR killer spotted targeting HR departments
- New ‘LucidRook’ malware used in targeted attacks on NGOs, universities
- New ‘Perseus’ Android malware checks user notes for secrets
- New ‘PolyShell’ flaw allows unauthenticated RCE on Magento e-stores
- New “Darksword” iOS exploit used in infostealer attack on iPhones
- Nine CrackArmor Flaws in Linux AppArmor Enable Root Escalation, Bypass Container Isolation
- Nordstrom's email system abused to send crypto scams to customers
- North Korea's APT37 Uses Facebook Social Engineering to Deliver RokRAT Malware
- North Korean Hackers Abuse VS Code Auto-Run Tasks to Deploy StoatWaffle Malware
- Number Usage in Passwords: Take Two, (Thu, Apr 9th)
- OFAC Sanctions DPRK IT Worker Network Funding WMD Programs Through Fake Remote Jobs
- Obfuscated JavaScript or Nothing, (Thu, Apr 9th)
- Open VSX Bug Let Malicious VS Code Extensions Bypass Pre-Publish Security Checks
- Open-Source CyberStrikeAI Deployed in AI-Driven FortiGate Attacks Across 55 Countries
- OpenAI Codex Security Scanned 1.2 Million Commits and Found 10,561 High-Severity Issues
- OpenAI Patches ChatGPT Data Exfiltration Flaw and Codex GitHub Token Vulnerability
- OpenAI Revokes macOS App Certificate After Malicious Axios Supply Chain Incident
- OpenAI rolls out ChatGPT Library to store your personal files
- OpenAI rotates macOS certs after Axios attack hit code-signing workflow
- OpenAI says ChatGPT ads are not rolling out globally for now
- OpenClaw AI Agent Flaws Could Enable Prompt Injection and Data Exfiltration
- Oracle Patches Critical CVE-2026-21992 Enabling Unauthenticated RCE in Identity Manager
- Oracle pushes emergency fix for critical Identity Manager RCE flaw
- Over 1,000 Exposed ComfyUI Instances Targeted in Cryptomining Botnet Campaign
- Over 14,000 F5 BIG-IP APM instances still exposed to RCE attacks
- Over 20,000 crypto fraud victims identified in international crackdown
- PTC warns of imminent threat from critical Windchill, FlexPLM RCE bug
- Paid AI Accounts Are Now a Hot Underground Commodity
- Paint maker giant AkzoNobel confirms cyberattack on U.S. site
- Phobos ransomware admin pleads guilty to wire fraud conspiracy
- Poland's nuclear research centre targeted by cyberattack
- Police dismantles online gambling ring exploiting Ukrainian women
- Police sinkholes 45,000 IP addresses in cybercrime crackdown
- Police take down 373,000 fake CSAM sites in Operation Alice
- PolyShell attacks target 56% of all vulnerable Magento stores
- Popular LiteLLM PyPI package backdoored to steal credentials, auth tokens
- Popular LiteLLM PyPI package compromised in TeamPCP supply chain attack
- Preparing for the Quantum Era: Post-Quantum Cryptography Webinar for Security Leaders
- Product Walkthrough: How Mesh CSMA Reveals and Breaks Attack Paths to Crown Jewels
- Proton launches new "Meet" privacy-focused conferencing platform
- Qilin and Warlock Ransomware Use Vulnerable Drivers to Disable 300+ EDR Tools
- Ransomware gang exploits Cisco flaw in zero-day attacks since January
- Researchers Trick Perplexity's Comet AI Browser Into Phishing Scam in Under Four Minutes
- Researchers Uncover Mining Operation Using ISO Lures to Spread RATs and Crypto Miners
- Residential proxies evaded IP reputation checks in 78% of 4B sessions
- Routine Access Is Powering Modern Intrusions, a New Threat Report Finds
- Russia Hacked Routers to Steal Microsoft Office Tokens
- Russia arrests suspected owner of LeakBase cybercrime forum
- Russian CTRL Toolkit Delivered via Malicious LNK Files Hijacks RDP via FRP Tunnels
- Russian Hacker Sentenced to 2 Years for TA551 Botnet-Driven Ransomware Attacks
- Russian State-Linked APT28 Exploits SOHO Routers in Global DNS Hijacking Campaign
- Russian hackers exploit Zimbra flaw in Ukrainian govt attacks
- Rust-Based VENON Malware Targets 33 Brazilian Banks with Credential-Stealing Overlays
- SQLi flaw in Elementor Ally plugin impacts 250k+ WordPress sites
- Scans for "adminer", (Wed, Mar 18th)
- Scans for EncystPHP Webshell, (Mon, Apr 13th)
- Shadow AI is everywhere. Here’s how to find and secure it.
- ShinyHunters claims ongoing Salesforce Aura data theft attacks
- ShowDoc RCE Flaw CVE-2025-0520 Actively Exploited on Unpatched Servers
- Shrinking the IAM Attack Surface through Identity Visibility and Intelligence Platforms (IVIP)
- Silver Fox Expands Asia Cyber Campaign with AtlasCross RAT and Fake Domains
- Six Android Malware Families Target Pix Payments, Banking Apps, and Crypto Wallets
- SloppyLemming Targets Pakistan and Bangladesh Governments Using Dual Malware Chains
- Smart Slider updates hijacked to push malicious WordPress, Joomla versions
- SmartApeSG campaign pushes Remcos RAT, NetSupport RAT, StealC, and Sectop RAT (ArechClient2), (Wed, Mar 25th)
- SmartApeSG campaign uses ClickFix page to push Remcos RAT, (Sat, Mar 14th)
- Snowflake customers hit in data theft attacks after SaaS integrator breach
- Speagle Malware Hijacks Cobra DocGuard to Steal Data via Compromised Servers
- Spyware-grade Coruna iOS exploit kit now used in crypto theft attacks
- Star Citizen game dev discloses breach affecting user data
- Starbucks discloses data breach affecting hundreds of employees
- Starkiller Phishing Suite Uses AitM Reverse Proxy to Bypass Multi-Factor Authentication
- Stolen Rockstar Games analytics data leaked by extortion gang
- Storm-2561 Spreads Trojan VPN Clients via SEO Poisoning to Steal Credentials
- Stryker attack wiped tens of thousands of devices, no malware needed
- Supply chain attack at CPUID pushes malware with CPU-Z/HWMonitor
- Suspected RedLine infostealer malware admin extradited to US
- TA446 Deploys DarkSword iOS Exploit Kit in Targeted Spear-Phishing Campaign
- TA446 Deploys Leaked DarkSword iOS Exploit Kit in Targeted Spear-Phishing Campaign
- TP-Link warns users to patch critical router auth bypass flaw
- Tax Search Ads Deliver ScreenConnect Malware Using Huawei Driver to Disable EDR
- TeamPCP Backdoors LiteLLM Versions 1.82.7–1.82.8 Likely via Trivy CI/CD Compromise
- TeamPCP Backdoors LiteLLM Versions 1.82.7–1.82.8 via Trivy CI/CD Compromise
- TeamPCP Hacks Checkmarx GitHub Actions Using Stolen CI Credentials
- TeamPCP Pushes Malicious Telnyx Versions to PyPI, Hides Stealer in WAV Files
- TeamPCP Supply Chain Campaign: Update 001 - Checkmarx Scope Wider Than Reported, CISA KEV Entry, and Detection Tools Available, (Thu, Mar 26th)
- TeamPCP Supply Chain Campaign: Update 002 - Telnyx PyPI Compromise, Vect Ransomware Mass Affiliate Program, and First Named Victim Claim, (Fri, Mar 27th)
- TeamPCP Supply Chain Campaign: Update 003 - Operational Tempo Shift as Campaign Enters Monetization Phase With No New Compromises in 48 Hours, (Sat, Mar 28th)
- TeamPCP Supply Chain Campaign: Update 004 - Databricks Investigating Alleged Compromise, TeamPCP Runs Dual Ransomware Operations, and AstraZeneca Data Released, (Mon, Mar 30th)
- TeamPCP Supply Chain Campaign: Update 005 - First Confirmed Victim Disclosure, Post-Compromise Cloud Enumeration Documented, and Axios Attribution Narrows, (Wed, Apr 1st)
- TeamPCP Supply Chain Campaign: Update 006 - CERT-EU Confirms European Commission Cloud Breach, Sportradar Details Emerge, and Mandiant Quantifies Campaign at 1,000+ SaaS Environments, (Fri, Apr 3rd)
- TeamPCP Supply Chain Campaign: Update 007 - Cisco Source Code Stolen via Trivy-Linked Breach, Google GTIG Tracks TeamPCP as UNC6780, and CISA KEV Deadline Arrives with No Standalone Advisory, (Wed, Apr 8th)
- TeamPCP deploys Iran-targeted wiper in Kubernetes attacks
- Telus Digital confirms breach after hacker claims 1 petabyte data theft
- Termite ransomware breaches linked to ClickFix CastleRAT attacks
- The AI Arms Race – Why Unified Exposure Management Is Becoming a Boardroom Priority
- The Hidden Cost of Cybersecurity Specialization: Losing Foundational Skills
- The Hidden Cost of Recurring Credential Incidents
- The Hidden Security Risks of Shadow AI in Enterprises
- The Importance of Behavioral Analytics in AI-Enabled Cyber Attacks
- The Kill Chain Is Obsolete When Your AI Agent Is the Threat
- The MSP Guide to Using AI-Powered Risk Management to Scale Cybersecurity
- The New Turing Test: How Threats Use Geometry to Prove 'Humanness'
- The Refund Fraud Economy: Exploiting Major Retailers and Payment Platforms
- The State of Secrets Sprawl 2026: 9 Takeaways for CISOs
- The State of Trusted Open Source Report
- The Zero-Day Scramble is Avoidable: A Guide to Attack Surface Reduction
- The silent “Storm”: New infostealer hijacks sessions, decrypts server-side
- Threat Actors Mass-Scan Salesforce Experience Cloud via Modified AuraInspector Tool
- ThreatsDay Bulletin: DDR5 Bot Scalping, Samsung TV Tracking, Reddit Privacy Fine & More
- ThreatsDay Bulletin: FortiGate RaaS, Citrix Exploits, MCP Abuse, LiveChat Phish & More
- ThreatsDay Bulletin: Hybrid P2P Botnet, 13-Year-Old Apache RCE and 18 More Stories
- ThreatsDay Bulletin: OAuth Trap, EDR Killer, Signal Phishing, Zombie ZIP, AI Platform Hack & More
- ThreatsDay Bulletin: PQC Push, AI Vuln Hunting, Pirated Traps, Phishing Kits & 20 More Stories
- ThreatsDay Bulletin: Pre-Auth Chains, Android Rootkits, CloudTrail Evasion & 10 More Stories
- Three China-Linked Clusters Target Southeast Asian Government in 2025 Cyber Campaign
- TikTok for Business accounts targeted in new phishing campaign
- Tool updates: lots of security and logic fixes, (Mon, Mar 23rd)
- Top 5 Things CISOs Need to Do Today to Secure AI Agents
- Traffic violation scams switch to QR codes in new phishing texts
- Transparent Tribe Uses AI to Mass-Produce Malware Implants in Campaign Targeting India
- Trivy Hack Spreads Infostealer via Docker, Triggers Worm and Kubernetes Wiper
- Trivy Security Scanner GitHub Actions Breached, 75 Tags Hijacked to Steal CI/CD Secrets
- Trivy Supply Chain Attack Triggers Self-Spreading CanisterWorm Across 47 npm Packages
- Trivy supply-chain attack spreads to Docker, GitHub repos
- Trivy vulnerability scanner breach pushed infostealer via GitHub Actions
- TrueConf Zero-Day Exploited in Attacks on Southeast Asian Government Networks
- Tycoon2FA phishing platform returns after recent police disruption
- U.S. Sentences Russian Hacker to 6.75 Years for Role in $9M Ransomware Damage
- UAT-10362 Targets Taiwanese NGOs with LucidRook Malware in Spear-Phishing Campaigns
- UH Cancer Center data breach affects nearly 1.2 million people
- UK sanctions Xinbi marketplace linked to Asian scam centers
- UK warns of Iranian cyberattack risks amid Middle-East conflict
- UK’s Companies House confirms security flaw exposed business data
- UNC1069 Social Engineering of Axios Maintainer Led to npm Supply Chain Attack
- UNC4899 Breached Crypto Firm After Developer AirDropped Trojanized File to Work Device
- UNC6426 Exploits nx npm Supply-Chain Attack to Gain AWS Admin Access in 72 Hours
- US charges another ransomware negotiator linked to BlackCat attacks
- US disrupts SocksEscort proxy network powered by Linux malware
- US warns of Iranian hackers targeting critical infrastructure
- Ubuntu CVE-2026-3888 Bug Lets Attackers Gain Root via systemd Cleanup Timing Exploit
- Varonis Atlas: Securing AI and the Data That Powers It
- Veeam Patches 7 Critical Backup & Replication Flaws Allowing Remote Code Execution
- Veeam warns of critical flaws exposing backup servers to RCE attacks
- Vertex AI Vulnerability Exposes Google Cloud Data and Private Artifacts
- VoidStealer malware steals Chrome master key via debugger trick
- Want More XWorm?, (Wed, Mar 4th)
- We Are At War
- We Found Eight Attack Vectors Inside AWS Bedrock. Here's What Attackers Can Do with Them
- Web Server Exploits and Mimikatz Used in Attacks Targeting Asian Critical Infrastructure
- WebRTC Skimmer Bypasses CSP to Steal Payment Data from E-Commerce Sites
- Webinar: From noise to signal - What threat actors are targeting next
- What Boards Must Demand in the Age of AI-Automated Exploitation
- WhatsApp Alerts 200 Users After Fake iOS App Installed Spyware; Italian Firm Faces Action
- WhatsApp introduces parent-managed accounts for pre-teens
- WhatsApp rolls out more AI features, iOS multi-account support
- When attackers already have the keys, MFA is just another door to open
- When your IoT Device Logs in as Admin, It?s too Late! [Guest Diary], (Wed, Mar 11th)
- Where Multi-Factor Authentication Stops and Credential Abuse Starts
- Why Password Audits Miss the Accounts Attackers Actually Want
- Why Security Validation Is Becoming Agentic
- Why Simple Breach Monitoring is No Longer Enough
- Why Third-Party Risk Is the Biggest Gap in Your Clients' Security Posture
- Why Your Automated Pentesting Tool Just Hit a Wall
- Wikipedia hit by self-propagating JavaScript worm that vandalized pages
- Windows 10 KB5075039 update fixes broken Recovery Environment
- Windows 11 KB5079391 update rolls out Smart App Control improvements
- Windows 11 KB5079473 & KB5078883 cumulative updates released
- WordPress membership plugin bug exploited to create admin accounts
- YARA-X 1.14.0 Release, (Sat, Mar 7th)
- Yanluowang ransomware access broker gets 81 months in prison
- Your MTTD Looks Great. Your Post-Alert Gap Doesn't
- Zero Trust: Bridging the Gap Between Authentication and Trust
- [Webinar] How to Close Identity Gaps in 2026 Before AI Exploits Enterprise Risk
- [Webinar] Stop Guessing. Learn to Validate Your Defenses Against Real Attacks
- ‘CanisterWorm’ Springs Wiper Attack Targeting Iran
- ⚡ Weekly Recap: Axios Hack, Chrome 0-Day, Fortinet Exploits, Paragon Spyware and More
- ⚡ Weekly Recap: CI/CD Backdoor, FBI Buys Location Data, WhatsApp Ditches Numbers & More
- ⚡ Weekly Recap: Chrome 0-Days, Router Botnets, AWS Breach, Rogue AI Agents & More
- ⚡ Weekly Recap: Fiber Optic Spying, Windows Rootkit, AI Vulnerability Hunting and More
- ⚡ Weekly Recap: Qualcomm 0-Day, iOS Exploit Chains, AirSnitch Attack & Vibe-Coded Malware
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- ⚡ Weekly Recap: Telecom Sleeper Cells, LLM Jailbreaks, Apple Forces U.K. Age Checks and More