Microsoft has a new OWA user interface in targeted release. So far it all looks good even if some features are still missing, Expect to see the new UI generally available in late 2018 or early 2019.
You can now connect Office 365 accounts to LinkedIn accounts (or block the connection at a tenant level). It’s a nice way to keep tabs on your LinkedIn contacts and find out what they’re doing with a simple click in an Office 365 people card.
Microsoft has released a new setting in the tenant Information Rights Management (IRM) configuration to control if attachments of messages encrypted with the Encrypt Only feature (in OWA and Outlook) are decrypted when downloaded. In fact, two settings are available. One for people with Azure AD accounts, and one for those without.