My Phone Explorer:
This is an useful software which helps to administer Sony Ericsson mobile phones. I have been using this from a long time. This software supports the following models T300, T610, T630, T68, K500, S700, K750, D750, V800, Z600, K700, P990i, P1i, M600i, W950i, W960i, G700, G900. The mobile can be connected to PC through IR, Bluetooth or USB cable. Some of its useful features are as follows:
1) Address book synchronization with Outlook and Thunderbird.
2) Send sms
3) Manage and receive calls.
4) File browser and cache to transfer files easily.

Download link to this file is: http://www.softpedia.com/get/Mobile-Phone-Tools/Sony-Ericsson/MyPhoneExplorer.shtml