We are facing a strange issue. I recently got O365 subscriptions and created a new email account there.
The user then installed Thunderbird and started sending/receiving emails. They would also go to O365 OWA (https://outlook.office365.com) and login to their account to send/receive emails.
The problem is - When the user sends emails from Thunderbird it doesn't show up in Sent Folder on OWA and when sent through OWA, it doesn't show up in ThunderBird Sent Folder.
Is there anything we need to do to make this work? - i.e. See all the Sent emails in Sent Folder on OWA or Thunderbird irrespective of where there are sent from.
PS: This is true when we use other mail clients like Microsoft Live Mail. Apparently it would only work if we use Outlook client and select Exchange Server and Auto-Discover in settings.