Since there is no calendar in Thunderbird that area is toasted. Contacts and emails should be transferable.

--> BEWARE THE SPAMMERS about OLM decoders and such. Just ignore them.

https://www.google.com/search?q=outlook+for+mac+alternatives&ie=utf-8&oe=utf-8 finds the prior discussions so I can see why you had Tbird troubles.
Bob

PS. Yes, I know about http://kb.mozillazine.org/Calendars_-_Thunderbird but I will not offer those since I've heard from folk that locked up or lost calendar information with those. My nod would be to try the Apple Mail and Calendar apps.