Problem sync'ing tasks with Nokia E61

[weety]

I sync my Nokia E61 to outlook and this is pretty trouble free. I do however have a problem with tasks that appear in the "outlook today" view. Synchronisation has generated some tasks that are merely represented by dashes. I do not see these on the phone and do not see them in the task view, but I do see them in Outlook today. I cannot get rid of these no matter what I do. I have tried to tick them as complete but they do not go. I have tried to open them but they do not open, i have tried to delete them but they do not delete. I started off with just one task when I sync'ed for the first time but now have five after almost a years use. Has anybody else encountered this problem. What can I do to get rid of them?