Well the idea is to develop a web-based email client customized for their special needs (an alternative solution is also welcome). As such, MAPI is not a requir

Well the idea is to develop a web-based email client customized for their special needs (an alternative solution is also welcome). As such, MAPI is not a requirement. Calendar and delegation are not a priority. On another note, using gmail/google apps would be great if they offered some kind of API, but afaik nothing official is available.