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October 11th, 2010 by admin


You installed and synchronize your AD Objects using DirSync, and Microsoft sends you lots of emails with the following content:

The following errors occurred during synchronization:

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Error Description

On-premises object ID

CYHN Unable to update this object because the following attributes associated with this object have values that may already be associated with another object in your local directory services: [ProxyAddresses X500:/o=ABX/ou=First Administrative Group/cn=Recipients/cn=CYHN;]. Correct or remove the duplicate values in your local directory. Please refer to for more information on identifying objects with duplicate attribute values. yhYEVVU28epkIUrQw/Q==


Microsoft Office 365 detects lots of duplicates ProxyAddresses that was synced from the local on-premise server.


These PowerShell script should help you gather the information needed to resolve this issue. Once the multiple instances on the same email address is removed from the various AD accounts dirsync should work without errors.

get-contact | where {$_.WindowsEmailAddress -match ” “} |ft identity

get-msoluser | where {$_.ProxyAddresses -match ” “} |ft userprincipalname

Get-MsolGroup | where {$_.ProxyAddresses -match ” “} |ft displayname, emailaddress

get-mailbox | where {$_.EmailAddresses -match ” “} | fl Name, RecipientType, EmailAddresses

get-DistributionGroup | where {$_.EmailAddresses -match ” “} | fl Name, EmailAddresses

get-user | where {$_.WindowsEmailAddress -match ” “} |ft identity

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This entry was posted on Monday, October 11th, 2010 at 12:27 pm and is filed under Uncategorized. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

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