Webmail and collaborative calendar

Hi!


For my school network I'm looking for a nice webmail interface and a
collaborative calendar.

1) Webmail: There is squirrelmail. How are your experiences? Should
one rather use it or try something, else?

2) Collaborative calendar: I'm aware of stuf such as WebCaleldar and
groupware tool such as phpgroupware or egouprware. While the two
latter are by far too big (why buy a tank to kill a mosquito)
WebCaleldar lacks some features which I need: I should be possible
that all users use by default the same calendar, but their entries
are marked as entries of these users. No single user calendars
shoule be present, but the database should still differ the single
persons by login and identify entries by username.


Any suggestions?

Thanx!

--
Michael

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