When my work email got migrated to Office 365, I found that the inbox rules (filters) were gone. It took me a while to find out how to set up the inbox rules. Here are the steps to get to the site to change them.
- Open a browser and visit this page
Replace shared-mailbox-address with your shared mailbox address.
- Click on organize email on the left side.
- Click on inbox rules on the top.
- Click on the plus sign to add a new rule.