Fix Outlook Automatic Replies Not Working in Current Builds
Question details
The user needs to fix an issue where Outlook automatic replies (Out of Office) fail to send, despite running current builds where previous bugs were reportedly resolved.

- Product
- Microsoft Outlook
- Device & OS
- not provided
- Scenario
- Setting up Out of Office automatic replies for an Exchange mailbox.
- Observed behavior
- Automatic replies do not work even after updating to versions like 2510 (build 19328.20266) where the issue was supposed to be fixed.
Before proceeding, ensure you have administrative access to your Exchange environment and that you know your current Outlook build version, as some steps require PowerShell.
Verify Exchange Web Services and Mailbox Rules
Check if Exchange Web Services is active and remove any conflicting or corrupted mailbox rules preventing replies.
Sometimes automatic replies fail because Exchange Web Services (EWS) is disabled for the mailbox, or because corrupted inbox rules interfere with the Out of Office feature.
Log into your Exchange Admin Center and verify that Exchange Web Services (EWS) is enabled for the affected user's mailbox.
Open Outlook, click on the 'File' tab, and select 'Manage Rules & Alerts'.
Review your active rules for any that might conflict with automatic replies or forward messages unexpectedly. Delete or disable any suspicious rules.

Use PowerShell to Inspect and Reset Mailbox Settings
Administrators can use Exchange PowerShell to check the rules quota and forcefully reset the automatic reply configuration.
Collect Logs and Contact Support
If troubleshooting fails, gather diagnostic information and escalate the issue to Microsoft Support.
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Frequently Asked Questions
Why did my Outlook automatic replies stop working after an update?
Sometimes new current builds can introduce conflicts with Exchange Web Services or mailbox rules, requiring you to inspect your rule quota or perform a reset using PowerShell.
How can I check my mailbox rules quota?
An Exchange administrator can inspect the limit by connecting to PowerShell and running the command: Get-Mailbox -Identity <mailbox> | Format-List RulesQuota.
Can corrupted inbox rules prevent Out of Office from functioning?
Yes, if your mailbox contains corrupted rules or has exceeded its rules quota, the server may fail to save or trigger the hidden Out of Office rule properly.
What information should I gather before contacting Microsoft Support about this issue?
You should collect your exact Outlook version and build number, mailbox type, detailed descriptions of the symptoms, and any relevant error logs.




