Cannot synch 02XDA IQ to Windows Vista with bluetooth

Firstly it works fine with a USB cable.

I follow the following procedures to connect and synchronize to Windows Vista using Bluetooth.

On the PC
Click Start, click Control Panel, click Hardware and Sound, click Bluetooth Devices. If your PC does not have built-in Bluetooth, make sure your USB Bluetooth adapter is attached.

Click the Options tab.

Select the Allow Bluetooth devices to find this computer check box.

Click OK.

On the device
If you have never attached your device to the PC using a USB cable, do so. After Windows Mobile Device Center starts, disconnect the device.

In ActiveSync, click or tap Menu, then click or tap Connect via Bluetooth.

When asked if you would like to set up a partnership, click or tap Yes.

Note:
On some devices, you may have to click or tap Add new device.

When the name of the PC appears in the list, select it and click Next.

Enter a passcode when prompted, then click Next.

On the PC
When prompted that a Bluetooth device is attempting to connect with the PC, click To allow this connection, click this message.

In the Add Bluetooth Device wizard, enter the same passcode that you entered on your device, then click Next.

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At this point I get the message Your Smartphone did not connect with BENQ. The connection failed or the passkey is incorrect.

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Any suggestions? Do I need to manually do something with COM ports?