Wish I could get things up and running
yes I am crying about no broadband again
If basically it did all what Zarafa webapp or webaccess did without the need for widgets and added the ability to delegate tasks then I doubt I would be bothered with the hassle of client mail apps.
With Zarafa and brick level my cheat was to run a version in virtualbox ship the backup and imapcopy back the mailbox. Only was ever needed once in three years but tasks just finish off the groupware where the basis of most operations can operate in the 80/20 rule.
Only other thing was Ical import and export. I found it quite easy to grab an Ical of UK holidays and save me or someone the hassle.
Export with a few clients I used to use phpicalendar to display a read only version of daily events and also it was a good historical list.
The only other thing is will openchange / zentyal / sogo provide developer links for things like plugins?
From time tracking to vcard input that maybe 3rd parties will start to add?