When Windows XP Pro is started Outlook is automatically started a.

We have loaded Windows XP service pack 2 and Office XP service pack 3 on to
our CEO's laptop, however ever since when he starts or restarts his laptop
Outlook starts up automatically. We can not find what is starting it, we have
looked in all the usual places, but can find no reference to starting this
programme.
Any suggestion??

Regards Mike Snell (UK)