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SBS 2003 migrate to EBS 2008 - unable to detect schema upgrade

Last Modified: 2013-11-10
We are trying to upgrade our existing SBS 2003 environment to EBS 2008. During the environment check it says:

A schema upgrade is required.

To continue the installation, you must upgrade your Active Directory schema. Run the Schema Upgrade Tool, wait up to 15 minutes for the replication to complete and the click Check Again.

At first the schema upgrade tool would not complete, and we had to fix some issues with the sysvol etc. But after all the issues were corrected we succesfully completed the schema upgrade.

When we re-run the Schema Upgrade Tool we get the message:

Your schema is up-to-date. If the Installation Wizard instructed you to run this tool, return to the Windows Essential Business Server Management Server and continue the installation. Click OK to close the tool.

The problem is that the Environment check keeps on saying that "A schema upgrade is required", we have waited more than a day now, and we have also tried to restart SBS 2003 server. We have also tried to restart the EBS 2008 setup from scratch but nothing helps.

What should we do to make EBS installation detect the schema upgrade? Or how can we troubleshoot the problem?
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