Hi Joe – from what I can see, you can’t import CSV files into Windows Live. But you can import ICS files. If it’s a Yahoo! calendar, I think they don’t have ICS as an option. So the trick would be to find a CSV to ICS converter, and from doing a quick Google search, it looks like some are available. Check THIS site, that may work. If you can do that, then you should be able to import using these instructions: You can import any calendar that’s saved as an .ics file. It can be from a calendar program or from the web. You have two options when importing a calendar: create a new calendar or import into an existing calendar. To import into a new calendar: 1. Save the calendar on your computer as an .ics file. 2. Go to Windows Live Calendar and sign in with your Windows Live ID. 3. On the toolbar, click Subscribe. 4. Select Import from an ICS file, and then click Browse. 5. Browse to and select the ICS file. 6. Click Open 7. Click Import into a new calendar. 8. In the Calendar name box, type a name for the calendar. 9. Next to Color, select a color for the calendar. 10. Click Import calendar. 11. Click Done. To import the calendar into an existing calendar: 1. Save the calendar on your computer as an .ics file. 2. Go to Windows Live Calendar and sign in with your Windows Live ID. 3. On the toolbar, click Subscribe. 4. Select Import from an ICS file, and then click Browse. 5. Browse to and select the .ics file. 6. Click Open 7. Click Import into an existing calendar. 8. Next to Select which calendar, select the calendar that you want to use. 9. Next to Prevent duplicates, click one of the following: -Only keep the new events: Any events previously imported from the same calendar will be replaced with newer versions of the same events. – OR – -Only keep the original events: Any events previously imported from the same calendar are kept, and only new events will be imported. 10. Click Import calendar. 11. Click Done. Hope that helps. I see now your question is kind of old; you’ve probably figured out how to do this already.