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In order to make use of your Bluetooth mouse you need to do the following:

# aptitude install bluetooth

First run

hcitool scan

to get the bluetooth MAC address (=$BTADDRESS)

After an intial connect with

hidd --connect $BTADDRESS 

you need to run

/usr/share/doc/bluez/examples/test-device trusted $BTADDRESS

to enable further automatic reconnects (e.g. on reboot).