Hi,
I recently posted the same question to SAP Support Services (CRM-BTX-GWI), because we're looking for a cloud base solution for both email and back office apps, and they responded with the following:
"I can confirm Server side groupware currently does not support the Mentioned technologies [Office365 or Google Apps], however Development are investigating these for future releases. With regards a release data on these , this is unfortunately not currently available."
Hopes this helps anyone else looking for answers to the same...
Jose