Duplicate entries in your Office 365 address book

If you’re seeing duplicate entries in your (Office 365) Outlook address book, and you do not see any those duplicates in Office 365 Portal, then try the following:

  1. Download and install the latest copy of the Microsoft Online Service Module for PowerShell from http://onlinehelp.microsoft.com/Office365-enterprises/ff652560.aspx
  2. Start a PowerShell session with Office 365 by running the following 5 commands (you will be prompted for your Office 365 credentials as these commands run):
  3. Import-Module MSOnline
    $O365Cred = Get-Credential
    $O365Session = New-PSSession –ConfigurationName Microsoft.Exchange -ConnectionUri
    https://ps.outlook.com/powershell -Credential $O365Cred -Authentication Basic -AllowRedirection
    Import-PSSession $O365Session
    Connect-MsolService –Credential $O365Cred

  4. Run the following command to check if you have anything in your Office 365 Recycle Bin:
    Get-MsolUser –ReturnDeletedUsers
  5. If the command above returns any Recycle Bin items, then run the following command to remove all items from Recycle Bin:
    Get-MsolUser –ReturnDeletedUsers | foreach { Remove-MsolUser -ObjectId $_.ObjectId -RemoveFromRecycleBin -Force }
  6. Run the command from step 4 again to make sure that your Office 365 Recycle Bin is empty