Before upgrading to Mac OS X 10.4 "Tiger," make sure that you update the firmware for your Apple Wireless Mouse and Keyboard first. The firmware updater for the Apple Wireless Mouse and Keyboard will not open in Mac OS X 10.4.
If you didn't do this before upgrading to Tiger, you can work around this issue by temporarily pairing the mouse and keyboard with a Bluetooth-enabled computer that's still using Mac OS X 10.3, and apply the firmware update from that computer.
The Wireless Keyboard and Mouse Firmware Updates improve Apple Wireless Keyboard and Mouse performance and reliability.
This document will be updated as more information becomes available.