http://www.osafoundation.org/our_product_desc.htm
Mitch Kapor!!!
Looks promising!
Email:
POP/IMAP retrieval
HTML viewing and composition
auto-completion of addressees
stationery
signatures
multiple profiles/personalities/identities
spelling checker
auto-archiving of old mail
fast searching via full-text indexing
importing existing data and settings
in-line viewing of attachments
user-defined views, rules, and filters
user-scripting capabilities
"active" mail - mail with buttons for actions
transparent encryption and authentication of mail
automatic Spam filtering
filing of messages in multiple folders
Information Sharing & Exchange
integrated Instant Messaging and presence management (Jabber)
sending contacts and appointments via mail (iCal, vCard support)
remote peer-to-peer browsing of others' data
flexible security model to control access
file and document sharing
remote queries, e.g., look up address in another person's contact list
automatic updating of information from remote sources: receive new contacts, changes to existing contacts automatically (publish-subscribe)
Access
home and work PC's with complete automatic replication of data
online or offline use with access to all data
synchronize with popular PDA's
Calendar
day/week/month views
recurring appointments
see another person's free/busy blocks for scheduling
see another person's calendars as overlays
Other
simple Web-style navigation (back, forward, and home buttons, single click on a link to navigate, bookmarks, URL references to user data)
easily customizable user-defined categories
structure data how you like it, view it that way, change your mind at any time
automatic recognition of names, places, dates, and etc.; automatic categorization of items
developer extensibility architecture