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The issue occurs because .NET 3.5 Framework is not installed in the server where the Exchange Connector is installed.

To resolve this issue:

  1. Open the Server Manager.
  2. Go to Features > Add Features.
  3. Select .NET Framework 3.5.1.
  4. Click Next > Install. Wait for the installation to complete.
  5. Restart the Exchange Connector service.
Keywords: Exchange Connector,Exchange ActiveSync,Exchange connector grayed out,Unsuccessful installation,Gray exchange connector icon,Installation error