I was told after I used the backup and restore procedure to copy Act! database to a different windows account, that the notes and history were all messed up in BOTH account's Act! version 2009.
I am not there, so I cannot be certain of the real problem. But, perhaps next time, instead of copying by backing up/Restore procedure (since the db files are locked from normal copying), I would just go to safemode and copy it that way. Safemode seems to work as I could delete the db files that way.
Go to task manager, end process for "sqlservr", and backup/copy/delete will be possible, even in normal mode.