If your in-game account is not the same as your forum account, you will get a letter from WOT development team notifying that your forum account will be deleted by July 20th 2011 unless it is unified with your game account.
This is no scam. Please contact User Support Service to prevent your forum account being deleted. In your message you must provide your current game account nickname and login and your forum account nickname and login which will be deleted after July 20th 2011.
See you on the battlefields!
UPD. The administration will never, not under any circumstances, request your password. Keep your passwords safe!