What is Outlook?

What it is

Outlook is Microsoft’s email and calendar application. In a Teams-first world, Outlook’s role has shifted — but it hasn’t shrunk. Email is still the primary channel for external communication, important decisions, and asynchronous coordination across time zones. Calendar is still where meetings are organised and free/busy is managed.

In 2026, Copilot in Outlook is one of the highest-traffic AI features in Microsoft 365. Copilot can draft replies, summarise long threads, suggest meeting agendas, extract action items from emails, and help you triage your inbox in the morning. The ‘Summary by Copilot’ button at the top of long email threads alone saves most users an hour a week.

The other 2026 development worth knowing about: the New Outlook redesign rolled out across desktop, web, and mobile. The new layout is cleaner, faster, and Copilot-aware throughout. If you’re still on the classic Outlook desktop app, switching to the new one is one of the best 5-minute productivity upgrades available.

Why it matters

Email isn’t going away. It’s still where external communication, formal decisions, and async coordination happen.

• Copilot in Outlook is genuinely productivity-changing. Inbox triage in minutes instead of an hour.
• Calendar is the operational backbone of meeting-heavy work. Knowing the calendar features (categories, scheduling assistant, focus time) compounds productivity.
• Many of the ‘I missed that email’ problems aren’t email problems — they’re inbox management problems. Outlook gives you the tools; most people don’t use them.

When to use this

• When you need to communicate externally (clients, suppliers, customers).
• When the message is formal, important, or needs an audit trail.
• When you need to schedule meetings, manage your calendar, or share your free/busy.
• When you need to summarise or draft replies to long email threads (Copilot in Outlook).

How to do it

1. Open Outlook — desktop app, mobile app, or browser at outlook.office.com.
2. The main views: Inbox, Sent, Drafts, Calendar, and any folders you’ve created.
3. Use the Search bar at the top — it accepts natural-language queries via Copilot (’emails from Sarah about Q3′).
4. Use Copilot in Outlook to: summarise threads, draft replies, suggest agenda items, extract action items, prepare meeting briefings.
5. Use Categories (colour labels) to triage emails. More flexible than folders, easier to search.
6. Schedule meetings via Calendar: select a time, click New Event, add attendees. The Scheduling Assistant shows everyone’s availability.
7. Use Focus Time blocks in your calendar to protect deep work hours.

Best practices

• Use Copilot summaries on any email thread longer than 4 messages.
• Categorise as you read. It’s faster than filing and easier to search.
• Use Focus Time blocks. Calendar visibility creates pressure that holds.
• Switch to the new Outlook if you haven’t yet. The classic version is being phased out.

Common mistakes

• Treating email as a real-time channel. It isn’t — it’s async by design.
• Using email when chat would be faster (and vice versa).
• Ignoring Copilot summaries. They save an hour a week per user.
• Letting your inbox grow to 50,000+ unfiled messages. Search still works, but triage gets harder.

FAQ