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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).