Hi @Mohamed Muaweya
Agree with the suggestion above from Andy, the error informtion "Property PermissionGroups can't be set on this object because it requires the object to have version 0.1 (8.0.535.0) or later. The object's current version is 0.0 (6.5.6500.0)." indicates that there is an old Exchange object still left in AD.
What's you newly installed Exchange server version and how many Exchange servers are there in your environment currently?
Check the path in ADSIEdit provided above to remove the legacy connector then verify the result again. And if the operation still not work, try the below steps:
- Recycle MSExchangeECPAppPool in Application Pools from IIS Manager. Application Pools > MSExchangeECPAppPool > Recycle.
- Run UpdateCas.ps1 and UpdateConfigFiles.ps1 from the exchange bin directory C:\Program Files\Microsoft\Exchange Server\V15\Bin.
- Restart IIS by running iisreset /noforce from a command prompt window and check the result.
We could also have a go by recreating the ecp virtual directory and see the results.
Remove-EcpVirtualDirectory -Identity <ecpvirtualdirectory>
New-EcpVirtualDirectory -Server <servername> -ExternalURL <externalurl> -InternalURL <internalurl>
Restart IIS
If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.