I read this somewhere on these forums but thought it was worth sharing.
1) Disable MissingSync USB's sync or Palm Desktop HotSync on Mac side (if applicable)
2) Connect USB cable to MacBook
3) Press HotSync button on Palm
4) Goto Parallels window, select USB button on toolbar, choose Palm Handheld
5) Cancel HotSync on Palm. Make sure HotSync on Windows is set to USB
6) Start HotSync on Palm again, this time the Windows HotSync should pick it up.
1) Disable MissingSync USB's sync or Palm Desktop HotSync on Mac side (if applicable)
2) Connect USB cable to MacBook
3) Press HotSync button on Palm
4) Goto Parallels window, select USB button on toolbar, choose Palm Handheld
5) Cancel HotSync on Palm. Make sure HotSync on Windows is set to USB
6) Start HotSync on Palm again, this time the Windows HotSync should pick it up.