You can add a shared mailbox to Outlook across platforms including Windows, macOS, and the web. The Microsoft 365 admin must ...

To apply a retention policy to a shared mailbox, you need to create retention tags and a new retention policy, attach the tags to the policy, and then apply the policy to the shared mailbox.

Delegated Mailboxes are used to provide access to a shared mailbox by authorised users within a team such as Registry Offices ... This will open the 'Change Account' dialogue. Select 'More Settings'.

Furthermore, groups are a new and improved way to do what used to be done through distribution lists or shared mailboxes. The list includes Microsoft 365, Distribution groups, Security groups ...