Version:           1.8.2 (using KDE 3.4.2 Level "b" , SUSE 10.0)
Compiler:          Target: i586-suse-linux
OS:                Linux (i686) release 2.6.13-15.8-default

Note: Part of this feature wish (the updating) is included in bug report #75566.

This is mainly a wish to improve usability/convenience. Working with Opera on a windows machine I find it very convenient that searches (filtered views) for typical defaults are created automatically. With "default" filters I mean that I would like to have searches automatically created for:
- unread mails
- contacts I received mails from/sent mails to
- mailing lists
- recent conversations (this might be tricky with the current search design)

New searches should be created on the following conditions:
1. a new mail is created, received, imported
2. auto-search-creation feature is turned on 
3. a search with the rule to be created does not exist yet

The automatically created searches could be hierarchically stored:
+ searches
  + manual searches
    - all mails about my booring project 
    - mails from my bosses
  + unread mails
  + contacts
  + mailing lists

The issue with updating those searches is already being discussed in the bug report #75566, so I will post my ideas about handling updates there.

However, the advantage of these automatic-filters would be that the filtering rules are very simple: typically just comparing the to/from/cc/bcc fields to all email-addresses in available contacts should be sufficient, and therefore very fast.