Microsoft has opened the floodgates to its My Phone service for Windows Mobile 6.x devices. Invitations are no longer required and anyone can now subscribe. Note that the service remains in beta.
My Phone allow users to store and manage their mobile device’s information onto a password-protected Web-based service. Featuring automatic syncing and backup, it makes it easier to restore data or switch to a new phone. It provides up to 200MB of free storage space.
The Microsoft My Phone service is free but will require to install an application on your Windows Mobile 6.x device to use it.