If your EGPWS warning activates when you are IMC then you must follow it. If you are VMC then you can make a Captaincy decision. Many of the early warnings you refer to were caused by the airfield but not the runway being in the database.
The database is updated regularly by Honeywell. Your company should update your aircraft regulalry and check that your destination is in the database as part of the flight planning process.
If you wish to check yourself then you can do so here
http://www.honeywell.com/sites/aero/...7B.htm#Airport