Hello and welcome. I had trouble syncing my yahoo calander to my BB. The only way to my knowledge is to either download a mobile version of Hotmail and run it as an app or you can set up daily email reminders to your Hotmail address. I did this with my yahoo acct, but then someone on here informed me of "google sync". Its an awesome app and it automatically updates every 2hrs, however you have to have a gmail acct. its a pain but it syncs directly to your BB calander
