Sunbird: i've lost my callendar adds

so i have just start using the portable applications, and i am wonder what is wrong ?
because i have install my portable sunbird as normal on my flash usb im my home.
i makes some adds in the calendar, cool

and when i came to internet cafe and I plug in my memoryStick and run sunbird, everything was gone !
but in my home computer it works fine ...

what to do ?
thx for help !
bye
daniel