You need to explain a bit more, read what in Thunderbird? I'm not an office-user? so what do you want to share

EDIT

Do you mean a shared folder in cloud or on office-server

Dear Gnospen, Thanks for your reply. I'm sorry, I should have expressed myself more clearly. My Office 365 account is a Microsoft Exchange account, and the shared folder is a folder on the Exchange server; this folder already exists and is shared by several users, each with their individual Exchange accounts. The shared folder is for a functional user, i.e. an inbox for function@company.com, whereas my.name@company.com points to my individual inbox.

I can access my Exchange account and my usual folders (inbox, drafts, and various other folders I've created for myself) by setting up an IMAP account in Thunderbird, no problems there, everything works great... however I cannot seem to find a way to set up an IMAP account in Thunderbird to access the shared folder and read mails landing in function@company.com's inbox. I hope this clarifies what I'm trying to achieve.

Cheers, krro

Hopefully someone experienced with exchange servers will reply. In the meantime here is a link https://support.mozilla.org/en-US/questions/1094931

Dear Gnospen, Thanks for the link. Yes, I did find that link before posting this question. It seems to concern the same (or highly similar) problem. I tried to set it up as instructed there. However, either I didn't understand fully how to implement the solution posted, or that solution simply doesn't work for me (for whatever reason).

Cheers, krro

Hello again! I now got it working. The trick was to set the Server settings as follows:

Server name: outlook.office365.com User name: my.name@company.com/sharedMailboxAlias

(where "sharedMailboxAlias" was the alias used for function@company.com set by our administrators)

Password used was my own, used for my.name@company.com.

Thanks anyway for your help!