My Phone will help you find your phone.

Microsoft has updated the My Phone online service, which offers 200 megabytes of free storage to synchronize your contacts, documents, and SMS from a Windows Mobile-based phone.

The update is significant and offers the following new features:
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* search for a lost phone;
* lock lost phone;
* photo sharing on leading social networking websites;
* saving space on your phone. Archiving data online for deletion on the phone.

From myself I will add that the client for WM has become nicer and faster. There is an official Russian localization.

Read more at myphone.microsoft.com

Here you can read a detailed review in Russian.