Microsoft Exchange couldn’t start additional synchronization now. The Active Directory Application Mode (ADAM) instance on a Edge Transport server can only receive configuration data from one Hub Transport server at a time. Wait for the current EdgeSync process to complete before trying a manual synchronization.

This Warning indicates that a user-initiated EdgeSync operation could not start because an EdgeSync operation is currently running. The Active Directory Application Mode (ADAM) instance on a computer that is running the Edge Transport server role can only receive configuration data from one Hub Transport server at a time.

To resolve this warning, wait for the currently running EdgeSync process to complete before trying a manual synchronization. For information about how to immediately start synchronization of configuration data to the subscribed computers that have the Edge Transport server role installed, see Start-EdgeSynchronization.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.