At the moment any changes/additions I make aren't synced.

     How do I add and sync this to my Thunderbird calendar.

Having finally got fed up with all the adds in Outlook.com, I've now started using Thunderbird as my email client! (I know, what took me so long?!) I've set up my email ok and it all seems to be working fine and syncing with my Outlook.com account, but I have some queries regarding the Calendar. I've managed to add my Outlook.com calendar to Thunderbird, but; 1 - How do I sync my Thunderbird calendar with my Outlook.com calendar? At the moment any changes/additions I make aren't synced. 2 - Also, someone shares their calendar (Outlook.com) with me. How do I add and sync this to my Thunderbird calendar. Although I love my tech etc, I'm only good with what I know, so please explain any solutions as clearly and simply as you can, sorry! Regards Mark