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Event ID: 8275 Source: MSADC

Source
Level
Description
ADC could not replicate <object name> to <object name> because the target object is not writable <connection agreement name>.
Comments
 
As per Microsoft: "ADC (Active Directory Connector) is attempting to replicate to a system object or an object in a different naming context that is not writable". See MSEX2KDB for additional information about this event.
If you put "NTDSNoMatch" in extensionAttribute10 of Exchange 5.5 mailbox, which disable the association with the owner account, the mailbox information is created by ADC in Active Directory.
The error may occur when you attempt to replicate mailboxes to Active Directory. To resolve this issue, put the primary Windows NT accounts for the mailboxes in the destination domain, or create an ADC Recipient_CA to the domain in which the accounts exist. Please see ME293474 for further details.

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