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Have you seen an instance where the stsadm preupgradecheck passed on Features, but the Test-SPContentDatabase found errors and the mount failed?

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If you can copy & paste the error log here we might be able to shed some light – pigeon Jul 5 '12 at 4:41

There were multiple versions of the pre-upgrade checker. It first arrived in SP2, but was updated with the Oct 2009 updates.

Overall though I've always found that the Test-SPContentDatabase is the most accurate, and if it identifies problems then you will have issues completing the upgrade. Resolve those issues and then proceed with mounting the content database.

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