OK, you did restores and you did Attaches. Which have the 70 instead of 90? Both? or just one type?  Don't know but I can investigate it asking people...

Hi Bob,

First thanks for your answer and your interest. We do not replicate this DB. I have create a job following your advise for detecting the hour of the Compatibility...

Are you sure that the only way for changing the Compatibility Level in SQL Server 2005 is through the execution of Stored Procedure 'sp_dbcmptlevel'?

Could it be possible that the external...

As far as I know, someone restored the DB from a Backup made in SQL Server 7.0

Don't know the Compatibility Level of that Backup (70, 65, 60)

As you say Actually...