opera 7.5

On upgrade, all e-mail from previous Opera versions will be reindexed for faster searching and sorting. This means that e-mail indexed by Opera 7.50 will not be compatible with previous versions of Opera.
Opera 7.50 (Beta 1 and final release both) fixes a Telnet URI handler vulnerability as reported in iDEFENSE Security Advisory 05.12.04. Users of earlier Opera versions are adviced to upgrade.
Opera 7.50 introduces a new toolbar setup. Previous toolbar customizations will be overridden on upgrade and can no longer be used.
At first glance
User interface redesigned
Chat client
RSS newsfeeds
Fast full-text indexing of e-mail messages
Support for spell check
Graphical smileys in chat and e-mail
New chat client
Uses the IRC (Internet Relay Chat) protocol.
New chat panel lists visited chat rooms and status of on-line contacts.
Textual smileys are automatically transformed to graphical ones.
Supports transferring files by the DCC (Direct Client-to-Client) protocol.
Opera Mail
Faster indexing and searching of e-mail messages
Learning spam filter and custom filters
Spam filter will be set to "learning" on upgrade regardless of previous setting.
New option to "Mark as spam".
Marking message as "Not spam" no longer adds sender to contacts.
Ctrl+X removes message from any filter
Spam filter will be set as learning when upgrading from 7.23 regardless of previous setting.
Unseen messages will now have the "Not visited" link color specified in Preferences > Page style > My link style.
Graphical smileys introduced.
"Organization" e-mail header is now indexed for searching.
Removed mailing lists from "Active contacts" access points.
Fixed problem with forwarding .txt attachments
Fixed problem entering Korean characters in search fields
Added support for subscription to RSS newsfeeds
"Newsfeeds" added as access point in the e-mail panel.
RSS 0.9x, 1.0 and 2.0 are supported.
Clicking RSS links automatically adds newsfeed to Opera Mail.