Historically, it's been Gmail. With Gmail, productivity will be
significantly increased because you receive enough storage that you
never have to delete email. Furthermore, there's no need to organize
email because of the powerful search function and email/IM threading.
Instant messaging is embedded in Gmail so you can respond to an email
in real-time. Also, your Gmail is available from any computer, at any
time so you're no longer limited to answering email at your desk. Gmail
is simple to use, but not simplistic in its functionality, which mean
less time required for user training.
Furthermore, Gmail is part of Google Apps, so you
get all the benefits of using Software as a Service. This includes
decreased TCO; improved functionality, usability and efficiency in your
day-to-day activities; and a fast and effective search function to
reduce time spent searching. You also get to experience the Google
speed of innovation with new features coming out all the time so
you have the most up-to-date service. To learn more about how Gmail
can save your business time and money, see
http://www.google.com/apps/intl/en/business/details.html
In addition to Gmail, Google Apps Premier Edition includes both messaging and collaboration tools like:
Google Talk which is our instant messaging client which gives you voice and video chat and file sharing
Google Calendar to help you keep track of your appointments and see your colleagues schedules to create meetings
Google Docs to help you create online word processing documents, presentations and spreadsheets that can be shared and edited in real-time by multiple users
Google Sites to help you create webpages to capture information, share files, photos, videos and other rich media.
Google Video which allows you to share videos within your business
To learn more about how businesses like yours are using Google Apps see:
http://www.google.com/apps/intl/en/business/customers.html