Some functions of the beta version available today don't work smoothly with the BlackBerry. For example, calendar item reminders that appear in a user's inbox are formatted awkwardly, with what appear to be images that don't load properly.

In some areas, Google has had to work around the BlackBerry's limitations. For instance, the BlackBerry mail client only lets users search e-mails that arrived within the past month. To look for older messages, a user has to log into a separate Google Mobile App client on the phone.

Google thinks the new service will encourage more businesses to use Google Apps. Organizations use Google Apps because it can be cheaper and easier to maintain than an on-premise system such as Exchange or Lotus Notes, Gulabani said. Some end-users want the familiar experience of receiving e-mail on their BlackBerry, however, hence Google is offering the new push service.

Google plans to update the service over time, by improving the end-user experience and increasing the number of users that can be supported on a BES server, Gulabani said.