exchange 4003 insuff_access_rights
Recently I had two exchange databases refusing to mount. There were many suggestions as to how to fix this, and whilst many of the suggestions worked for most people my resolution was different. It turned out that the drive where the databases and logs were kept needed to be repaired. It had developed bad sectors
I right clicked on the drive, after taking backups of the databases and logs, and got windows to run a repair. After this the databases instantly mounted. It seemed that because exchange couldn’t write to part of the drive it assumed it was a permissions error.
I hope this helps other people out there and let me know what you think.