In this article, we assume that you've already created a shared mailbox in your Office 365 and granted permissions to the user you are going to use in Jitbit.
Fetching emails from a shared mailbox is a bit tricky since Microsoft does not provide many tools to make it convenient for an end-user. Here are the steps you need to do:
Go to Jitbit - Administration - Email - Edit incoming mailboxes.
Choose "Office 365" as a connection method and follow the onscreen instructions to connect your mailbox. You should see something like this:
Now you need to go back to the Jitbit admin panel and remove the mailbox we've added previously. After you remove it, connect it again and click "edit".
Enter the shared mailbox address in the "hostname" column and click "save":