Thunderbird and MS Office365?

[S.Bob]

All;

I have a new gig, the client runs office365 (ugh). I did the new email 
account in thunderbird, used "outlook.office365.com" as the incoming 
IMAP server and I can receive emails but not send.

I used another account for sending (SMTP), since "outlook.office365.com" 
did not work but now all my sent items go to ther junk mail (ultimately 
coming from another domain), and I also find that if I set it to 
automatically bcc my office635 email for sent messages, they dont show 
up either...

Thoughts? Is there a better way to interact with office365?

Thanks in advance