Some questions on 6600
If you use the web browser(Opera?) would you need to subscribe to t-zones?
Can you use mp3 as ringtones?
Yes you would have to subscribe to t-zones.
and no you can not use MP3's as ringtones.
Yes it does sync with MS Outlook if you download the Nokia 6600 PC Suite.
True, but two things to note:
1) The 6600 Suite is just as flaky as other versions of the Nokia's PC Suite. It does not install and work easily, the installation manual is wrong and activating synchronization is cumbersome.
2) There is NO support in the 6600 Suite for SMS messaging and apparently no support planned. This means you cannot send or receive SMS messages to/from your computer.