On my home computer and my lap top I have Thunderbird installed. Both profiles are identical. The emails on both systems are updated by just downloading them from the provider account. My calender is normaly used on my home computer as well all appointments are saved there. Going on longer trips away from home I would like to import all my calendar data from my home computer to my lap top. Copying the complete profile takes too much time. By just copying the calendar-data file to my lap top I do not get a working result. What do I miss? Thanks for help Detlef