Siemens Data Suite is a tool that you can use to synchronize your Siemens mobile phone with your computer. So, you have easy access to managing your phone's content directly from your PC.
During the installation process, you are required to select the phone you own (S55, SL55, M55, M56, MC60, C60), so if several people with these Siemens models want to use this software from the same computer, you have to reinstall it.
The interface is pretty dull, and it would definitely need some changes.
In this program you can transfer information from your mobile phone to your computer, and viceversa. This includes contact information (address book, missed calls, received calls, dialed calls), and message information (inbox, outbox, drafts, archive).
You can also select a ringtone and assign it to all calls or only a specific caller, edit the phone's images (e.g. wallpaper), or start the GPRS modem assistant.
Overall, Siemens Data Suite could certainly use a redesign. Plus, it likes to crash every now and then, and that would make anyone unhappy. Then again, it was tested on a Windows 7 x64.
The concept is very good, but the developers should have worked more on integration.
At least it's free, which is definitely a nice bonus, and the memory the application uses is barely noticeable.
In conclusion, if you want a software that allows you to manage your Siemens phone from the comfort of your computer, and don't mind the random glitches, then feel free to try Siemens Data Suite.