I know HORDE (webmail) from before and it was always a good groupware, stable - clean - fast!
I would be happy if it would be used as SOGo replacement, unfortunately, I see in WebTop no full replacement.
What I do not personally like is this mystery.
And SOGo in the current version I find almost embarrassed - in the version it was top - now it is slow - cumbersome - inflexible; Pity!
But these are my impressions, for me count vll other values.
The following points I put to a groupware:
- Multi email capability (multiple email accounts)
- Calendar (personal / team)
- Address book (personal / team)
- Sync smartphone with CalDaV & CardDAV
- intuitive operation
- Language Support (German)
- Long running times
If we set on a groupware should be supported over a long period of time, every year a change does not bring, at least my wife not