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No concerns at all. These are warnings (to application developers) that the application is making system calls to routines that Apple is in the process of phasing out. Apple has already made new system calls available to duplicate the functionality of the deprecated ones, and in a future system upgrade these deprecated calls may be removed. I suggest you turn off logging in Console's preferences unless you are beta testing.
There is no published list. All Entourage generated errors get a descriptive text as well as the error number. However, if you get an error number without descriptive text, it's coming either from a mail server or the Operating System or some other application not from Entourage.
Many of the errors in Entourage are simply return results from whatever the server passes. Your ISP might be able to help you with these. If the message simply says "An error occurred" and gives a number, this is an Apple operating system message.
Check the Error Page for the list we have collected.