Office 365 – IdFix DirSync Error Remediation Tool

imageMicrosoft is providing a tool to assist Office 365 administrators and support team to troubleshoot and solve directory synchronization issue.

As reminder, you can find the list of attributes that are synchronized with Office 365 here

This tool, called IdFix DirSync, is available from

EDIT this tool can be run ONLY on Windows 7 or Windows 2008 R2; I can confirm this is not working on Windows 8 client. The latest version is running on all client/server starting Windows 7



  • Download the file from the URL and run the IdFix.exe which is a self-extracted ZIP file
  • By default, the files extracted will be located below C:\Deployment Tools\IDFix\IdFix_version_1.02
  • There will be 2 files:
    • Office 365 IDFix Guide version 1.02.docx which is a documentation
    • IdFix.exe.rename which is the tool itself; you have to change the extension by removing the .rename suffix


  • Run the IdFix.exe file
  • Agree the privacy warning – it’s more about stating if you are an end-user you should contact your administrator


  • As soon as the tool has been launched, a log file is automatically generated with date and time as file name


  • Then click on the Query button to load your Active Directory; depending of the number of objects is may take some time


  • Then the tool displays the Active Directory query and shows attributes which may be in error if/when synchronized with Office 365, as well the reason of the error



  • The different actions available are:
    • Complete: meaning the original value is acceptable and should not be changed
    • Remove: meaning the attribute in error will be cleared
    • Edit: meaning the correction value proposed by the tool will be applied to the attribute


  • If you click on the Apply button all the actions you have defined will be applied onto your Active Directory. I will never say it enough, always take care of what you are doing on your Active Directory


  • You can also don’t want to apply any action but wanted to check/ensure your Active Directory is in a good health for Office 365 DirSync – or even more important, you should never apply any automatic action on an Active Directory in production and in this situation you may want to test in a test environment. In these cases, you can save the results as LDF file by hitting the Undo button; you will then be asked for a filename and folder destination. If you hit the Save button this will export the results as CSV file

NOTE after the Undo request, the results are cleared from the tool


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