It would depend
on the needs of the organization. I've not found any need for 90% of the functions in Evolution.
Mozilla's Thunderbird for email.
[ using the Seamonkey suite, the only thing missing from the basic use is a calendar app, which is installed by default with any linux distro that has a PIM suite included. ]
I don't have a palmtop, or ipod like device, so the whole synch issue is of no importance, I don't use any calendaring app, since I have an excellent memory and use that.
For me, the requirements are met by much smaller apps.