Webmail/Groupware suite

["James A. Peltier" <james_(_at_)_site-fx_(_dot_)_net>]

Hi All,

I'm looking for any information that people can provide about web based 
mail and groupware suites.  I'm looking for something that works in 
conjunction with a PostgreSQL database.  I would like it to store all 
calendaring, mail, addresses, etc in the PostgreSQL database.

Does anyone know of anything that fits the bill?  All comments and 
experiences are welcome.

- James