The Exchange Online connector uses Exchange Online PowerShell V3 module to access data in Exchange Online.
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The Exchange Online PowerShell V3 module must be installed on the synchronization server.
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If Exchange Online is accessed directly from the workstation on which Synchronization Editor is installed, the Exchange Online PowerShell V3 module must also be installed on this workstation.
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If direct access from the workstation to Exchange Online is not possible, you can set up a remote connection. The Exchange Online PowerShell V3 module must be installed on the remote connection server.
For more information about prerequisites and installing the Exchange Online PowerShell V3 module, see the Exchange Online PowerShell documentation from Microsoft.