I have had problems with removing partnerships when I started toying with Windows Mobile Devices. It is clear from this sites search queries, that I am not the only one. It is easy once you get the hang of it.

Once you remove a partnership, your device will not lose all its data. This will happen when you set up a new partnership later on, and then you will be asked if you would like to keep the data from your device, or your computer intact.

To remove a partnership, ensure that your device is no longer connected to your computer.

In WMDC:

Click “Mobile Device Settings”

Click “End a Partnership”

You will be given a warning that you are doing something bad and then you will be asked if you want to delete the Synchronisation folder. I don’t delete it as I will use the same folder next time I try to create a partnership.

This is not something that has to be done very often, but there are some circumstances where it is required.