Duplicate email messages appear in Outlook for Mac 2011

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You receive duplicate email messages in Microsoft Outlook for Mac 2011. 


This problem can occur for the following reasons: 

  • One or more rules are configured incorrectly.
  • An email server is down for maintenance.
  • Your Outlook database is corrupted. 


Step 1: Check your rules

  1. Start Outlook.
  2. On the Tools menu, click Rules.
  3. Verify that each rule is correct.
The best way to pinpoint a problem with rules is to disable all your rules, and then re-enable the rules one at a time. To do this, follow these steps: 
  1. Start Outlook.
  2. On the Tools menu, click Rules.
  3. In the Name column, select a rule that you created.
  4. Click to clear Enabled.
  5. Repeat steps 3 and 4 until all rules have no Enabled option to clear.
  6. Test Outlook.
  7. If the issue is resolved, enable one rule at a time, and test Outlook after each step. 

Step 2: Remove duplicate accounts
  1. Start Outlook.
  2. On the Tools menu, click Accounts.
  3. If duplicate account names are listed, click a duplicate account, and then click the minus sign ("-") icon in the lower-left corner or press the Delete key on your keyboard to delete that account. 
If there are no duplicate accounts, go to the next step. 

Step 3: Rebuild the database

Rebuild the Outlook identity database. For more information, click the following article number to view the article in the Microsoft Knowledge Base:  
2360509  Rebuild the identity database to resolve problems in Outlook for Mac 2011  


Article ID: 2434502 - Last Review: August 29, 2011 - Revision: 6.1
  • Microsoft Outlook for Mac 2011
dftsdahomeportal KB2434502

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