Mac OS X operating system includes preferences for every application, including Microsoft Entourage.
The preferences are used by the operating system and user to define who has the permissions to read, write, and update the data and application settings.
Sometimes, corruption to the preferences may make your Entourage database inaccessible and lead to Entourage repair solutions.
In case your Entourage account and database become inaccessible due to damaged preferences, you can try repairing the preferences using Apple's Disk Utility.
Go through the below steps to repair preferences in Mac OS X-

• Launch Disk Utility from Utility folder under Applications.
  
• Click First Aid tab and then choose Repair Permissions
• Click to select the icon of boot volume.
  
• Click Repair Permissions button.
  

You are advised not to run the Repair Permissions from installation disk of Mac OS X operating system.
The updates usually contain latest version of the Repair Permissions.
You should run the Repair Permissions tool from host volume.
You should always keep in mind that repairing the application preferences can fix the problems only to application.
It cannot repair Entourage database if there is any corruption.
In order to recover Entourage database, you need to rebuild the same using Database Utility.
If your precious data remains inaccessible even after rebuilding, you are required to opt for third-party Entourage recovery tools.
Entourage database recovery software are particularly designed to perform thorough scan of whole database and extract all inaccessible data from it.
Microsoft Entourage recovery software come equipped with simple and rich graphical user interface to offer easy Mac Entourage recovery.
They preserve absolute integrity of your precious data as of their read-only and non-destructive design.