Can anyone tell me of a successful implementation of this service, how it went, costs user acceptance ?

http://www.esnatech.com/google/googleapps.htm?gclid=COGF8OauqJQCFRYFewodA2rItw

Esnatech’s Telephony Office-LinX™ UC gateway for GOOGLE applications changes the landscape and starting point for business communications. Now any business regardless of size or budget can increase employee productivity and effectiveness while dramatically improving customer satisfaction by simply investing in a Telephony Office-LinX UC gateway and subscribing to GOOGLE applications! No need for a new phone system, no need for any changes to your office hardware.

Simply 3 easy steps to get started with Unified Communications

* Connect the Telephony Office-LinX UC gateway for GOOGLE to your office phone system.
* Subscribe to GOOGLE applications
* Point the UC gateway to your GOOGLE domain

Hi, I know recently Serena software has switch to Google Apps from MS Exchange.

Serena is a privately owned company with 29 offices in 14 countries and approximately 800 employees. Founded over 25 years ago, Serena has over 15,000 customers including 96 of the Fortune 100.

"The Vmerge solution from Voice Mobility is currently in place for all of our global employees," said Sean Cunningham, Manager, Worldwide Network Operations, Serena Software. "We selected Voice Mobility because it was the only vendor to provide native integration and a unified mailbox with Google Gmail(R)." With Google Apps(R) and Google Gmail(R), free or premium service combined with the cost-effective UCN Vmerge solutions, IT managers can roll out new technology to keep pace with consumer technology. for more information http://www.tmcnet.com/usubmit/2009/05/27/4197961.htm.