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📱When Outlook for IOS or Android Fails Silently: Hybrid Setup, IIS Rules, and Hidden Blocks
Everything looks fine – the user sends an email from Outlook for Android, no errors pop up… but the message never arrives. In a hybrid Exchange setup with HMA enabled, things can go wrong in unexpected places. In this post, we track down an issue that doesn’t show up in IIS logs – and explain…
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🛡️Default FrontEnd Connector in Exchange: Open Door or Necessary Entry Point?
Did you know that your Exchange server might be allowing anyone to send anonymous emails to internal users by default? In this post, I explore the security implications of the Default FrontEnd receive connector, why it matters in hybrid environments, and how attackers might exploit it. Based on findings from real Risk Assessment Programs, I…
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✉️Finding the Bottleneck: Troubleshooting Hybrid Mail Flow
Hybrid mail flow can be tricky – sometimes everything looks fine, but messages vanish, bounce, or take mysterious detours. In this post, I walk through a real-world approach to diagnosing mail flow issues in Exchange Hybrid setups. From checking connectors to diving into logs, you’ll find practical steps to trace where your emails really go…
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🌐Federation Trust in Exchange: When Trust Breaks Down
Federation Trust is the backbone of cross-organization sharing in Exchange – but what if it breaks? In this post, I cover a real-world case where the trust silently failed, impacting Free/Busy lookups and external sharing.
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🔄Migrating Exchange Online Mailboxes Without a Cross-Tenant License
Microsoft officially requires a cross-tenant migration license to move mailboxes between tenants – but there are cases where it’s not strictly needed. In this post, I share a real-world scenario of cross-tenant Exchange Online migration without purchasing the license. Learn what’s possible, what risks are involved, and how to stay compliant (or at least well-informed).
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🔐Multi-Factor Authentication in Exchange Server: What’s Really Possible
You know MFA is a must-have for cloud security — but what about Exchange Server on-premises? In this post, I explore how multi-factor authentication can be implemented in Exchange, what Microsoft officially supports.
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✍️Why Teams Meetings Fail for Delegates in Exchange Hybrid – A Hidden Message Mystery
Delegates in Exchange Hybrid may seem properly configured – but Teams doesn’t think so. Let’s find out how Outlook and EWS see things differently.
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✍️Reconfiguring Exchange Hybrid with a New Tenant – Real-World Pitfalls
Rebuilding hybrid config with a new tenant? It’s not just rerunning HCW. Here’s what broke in real life – and how I fixed it.
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📝Fixing OWA Login Failures After Mailbox Migration from Exchange Online to On-Prem (SDServerErr;System.ArgumentException)
After migrating a mailbox from Exchange Online back to on-prem, OWA login may fail with SDServerErr and System.ArgumentException. Here’s how to fix it using MFCMAPI – and how to prevent it with PowerShell.
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📝Cloud Archive Not Available in OWA for On-Prem Exchange Users – Federation Trust Required
Can’t open cloud archive in OWA, but it works in Outlook? In hybrid Exchange setups, this may be due to missing Federation Trust. Here’s how to check and fix it.
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