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Summary
Restore missing delegate meeting invitations in Outlook when message trace reports StoreDriverRules and Message is deleted by mailboxrules. Check the mailbox owner's hidden inbox rules, and remove and re-add the affected delegate to rebuild the meeting-request delivery configuration.
Symptoms
- A current delegate doesn't receive meeting requests for the mailbox owner.
- A former delegate continues to receive meeting requests.
- Message trace reports
StoreDriverRulesandMessage is deleted by mailboxrules.
Cause
Outlook creates a hidden inbox rule on the mailbox owner's mailbox when you add a delegate and choose who receives meeting requests and responses. If the rule still targets a removed delegate, or if it's set to delete the owner's copy of the message, the mailbox rule deletes the meeting request instead of delivering it. In that case, message trace reports StoreDriverRules and Message is deleted by mailboxrules.
Resolution
Use these steps when meeting invitations don't reach the current delegate or continue to reach a former delegate.
In the Exchange admin center, run a message trace for an affected meeting request and confirm that a mailbox rule processed the message.
Review the mailbox owner's inbox rules, including hidden rules.
Get-InboxRule -Mailbox owner@contoso.com -IncludeHiddenFor syntax and parameter details, see Get-InboxRule.
In Outlook, sign in as the mailbox owner.
Open the delegate settings, remove the affected delegate, and save the change.
Add the delegate again and choose who should receive meeting requests and responses.
Recreating the delegate relationship rebuilds its meeting-request delivery configuration. For delegate options, see Allow someone to manage your mail and calendar in Outlook.
Verify the resolution
Send a new meeting request to the mailbox owner. Confirm that the current delegate receives it and that a removed delegate doesn't. Run another message trace if delivery still fails.