Ever since Exchange 2013, the web version of Outlook has had the same features and interface as the Outlook client – it's also what the Exchange Online admin centre is built on, and you can just mark a user as an administrator. This removes the need for an Exchange mailbox to administer Exchange, so you don't have to waste a mail licence and storage quota on a shared mail admin account. You can also give different administrators limited permissions; if someone only needs to use the compliance or discovery tools, they won't get access to mail flow and user settings.
The admin centre is crammed with features, organised into around a dozen categories. Previously complex tasks, like setting up a federation trust to make free/busy times in user calendars visible or setting up shared mailboxes for call centres, are far simpler and you are guided through important steps (like giving users the right permissions to access the shared mailbox).
Public folders are still available, by popular demand. Like everything else in the new Exchange Online, they're simple to set up with helpful error messages that make clear what you've done wrong and how to fix it.
There's also a helpful balance between enforcing policy and users getting work done. The data loss prevention tools in the Enterprise version of Exchange Online let you set up rules to stop people emailing personal information like credit card numbers (with a smart check that employs the same algorithm used to issue credit card numbers, rather than just looking for any 16 numbers in a row).
But users can also override most of these policy warnings by filling in an explanation and confirming they know the message will be logged. The information can be encrypted to keep it safe until the manager approves the explanation.
The tips reminding users of the policy show up in Outlook clients, and Outlook webmail. But if you send a message from your smartphone that breaks a policy, the rule can forward the message to your manager or mail you to confirm that you meant to break the policy.
But while the ultra-minimalist, white-space design is well organised, and will be familiar to Exchange Server admins, it doesn't match the style of the new Office 365 portal. There is also quite a lot of overlap – many tools from the Exchange Online portal also show up as links in the main portal to the auditing, mail flow and information protection tools (spam and malware protection and data leakage policies that block or warn users who are trying to send details like credit card numbers in email). These open the tools in either the Exchange Online or Security and Compliance portals.
There are also some settings you might expect to find in Exchange that are in the main Office 365 portal, like choosing whether users can share their calendars with people outside your organisation.
Like Exchange Server, you can use Exchange Online for mobile device management by setting policies that will apply to any smartphone, like forcing the user to turn on encryption and set a PIN, and even setting how often they have to re-enter it.
Office 365 also includes Microsoft's Intune MDM service which adds extra features like detecting whether devices are jailbroken, and letting you mark emails and documents that can only be opened in approved mobile apps, like Office, and only saved in specific locations. You can also selectively wipe devices, removing business data but not personal photos and information.
The Exchange tools for managing mobile device access are still in the Exchange Online admin portal, which is where admins who are used to Exchange Server will expect to find them. The Intune MDM features are in the Security and Compliance centre – and yet again, that opens a new browser tab, because it has its own interface.
This is the kind of duplication we expect Microsoft to clean up as it continues to improve the Office 365 admin UI, and the disparate interfaces shouldn't distract from the fact that you're getting a powerful mail system with all the options you need. And if you don't need to delve into those options, you can be up and running quickly with a rock solid mail system. Exchange Online remains one of the crown jewels of Office 365.