Gmail's mobile client for BlackBerry has been updated to version 2.0.5. One of the most important changes is that you can add the credentials for multiple accounts and switch between them without entering the password. There's also support for Google Apps accounts, which previously required a separate application.
“The Gmail application will run in the background, periodically checking for new email. This uses data. If you do not want Gmail to run in the background, you must explicitly quit the program by going to Menu > Exit Gmail,” explain Gmail's help center.
Source:→ Google System