I own a Sony Ericsson T630 and manage my contacts with Outlook trough Bluetooth.
This has the side side-effect that I finally started adding everyone I might need to contact to my Contacts, before that I just picked an email and used the Reply-To ;)
But there is one thing that bothers me, I store my numbers in international format (eg: +32 50 .....), but Outlook always removes the + in front of it, and I can't find how to change that. And my phone needs the +!
So I wrote a C# tool that would let me fix my contacts.
You can download it here and read the full article here.