I like to use my Thunderbird monthly calander as a diary using the date box as 'completed' when the task is finished with. (and also this acts as a 'nothing further to be' done'.) A tick marker is or was my favouite in the name of the task. Doesn't look as if I can edit a name with a tick mark in Thunderbird but is there anytjhing else I could do which is quick and easy ?