#exchange-online
8 articles
News3
Microsoft Exchange Online Mailbox Access Issues Hit Outlook
Microsoft investigates Exchange Online mailbox access problems affecting Outlook mobile and macOS users intermittently for several weeks.
Exchange Online Virtual Account Bug Blocks Email on Mobile and Mac Apps
Microsoft is investigating an ongoing Exchange Online service disruption that has intermittently blocked users from accessing their cloud mailboxes via Outlook mobile and Mac apps since Thursday, caused by a newly introduced virtual account that is now being rolled back across affected environments.
Exchange Online Outage Blocks Mailbox Access Worldwide
Microsoft's Exchange Online service is experiencing a global outage preventing users from accessing mailboxes and calendars today.
Tutorials3
How to Import PST Files into Exchange Online in Microsoft 365
Learn to migrate PST archive files to Exchange Online mailboxes using Microsoft Purview portal, AzCopy uploads, and CSV mapping files for bulk email migration.
How to Track Email Messages in Exchange Online Microsoft 365
Learn to monitor and trace email messages in Exchange Online using the modern Exchange Admin Center and PowerShell. Track delivery status, troubleshoot mail flow issues, and generate comprehensive email reports.
How to Clean Up Certificates from Office 365 Exchange Online Hybrid Application
Remove outdated certificates from Office 365 Exchange Online application using PowerShell scripts to secure your hybrid Exchange environment and prevent authentication issues.
Fix Guides2
Fix Winmail.dat Attachment Issue – Exchange Online/Office 365 2026
Recipients receive Winmail.dat files instead of actual attachments when emails are sent from Exchange Online. This occurs due to TNEF format settings in remote domains configuration.
Fix Microsoft 365 Domain Reputation Block – Exchange Online 2026
Microsoft 365 domain reputation blocks prevent legitimate emails from reaching recipients. This guide provides proven methods to identify, submit, and resolve domain blocks through Microsoft Defender for Office 365.