I'm not sure to explain this, I only just figured out why etc. myself. But I'll try. In iCal's left column I have: CALENDARS * Private * Work MOBILEME * Work When in iCal, I can only create events in the "CALENDARS", because, according to iCal, the "MOBILEME: Work" is a calendar created for to-do's within Mail and I cannot add event to it. So I figure, in Mail.app, I'll just add my to-do's to the "CALENDARS: Work"-calendar, but no I can't ... the only option I have is the "MOBILEME: Work"-calendar, like in this image where the option is "Home", from Apple's website: It seems to be because the e-mail to which I'm attaching a To-Do is received on my MobileMe account, as I use for all my e-mail (I have several Mac's and an iPhone). If I use a POP3 account, I can select any of the "CALENDARS"-calendars, but not the calendars within the MOBILEME category. So basically I'm screwed here. I use MobileMe for all my mail as I reply to mail from lots of places, but because of that, I cannot use To-Do lists properly. It's sooo easy to just highlight a text from an e-mail and click "To-Do button" and that's pretty much it. The only alternative is to create a manually To-Do but I don't know if you can link to the e-mail that way, etc. What to do here? Edit: I guess if I could just tell Mail.app to use my local calenders for to-do's, then they would automatically be synced with MobileMe just like my events in those same calendars. But maybe that's not possible?