Sogo has a good mailing-list. You can search the archive:
https://lists.inverse.ca/sogo/arc/users or join and ask any specific
quotation.
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Hi Rami,
Currently I use horde in one location and SOGo3 in another, as far as
looks/responsiveness goes SOGo3 is a definite winner.
As far as search goes I haven't been putting either through the paces
on that yet.
Thunderbird has pretty strong search as far as I recall, mailpile is
something
