Microsoft Outlook

What it does

Outlook brings email, calendars, contacts and to-do lists into one view, on the web, on desktop and on mobile. You can connect other email accounts, attach files from your cloud storage and schedule meetings from the same window.

A free Outlook account gives you a mailbox with core security features such as spam filters. Paid Microsoft 365 plans add ad-free use, larger storage and advanced security. Business plans include custom business email on your own domain. Copilot in Outlook can summarise long threads, draft replies and coach your writing.

Why you would need it

You need Outlook when your customers, your partners or your own company run on Microsoft 365. Invitations arrive as Outlook invites, files arrive as Office documents and half the company expects to see your availability in an Outlook calendar.

The pain without it is small but constant: mismatched calendars, double-booked slots and email split across accounts. One client that handles all of it, with the admin controls behind it, removes that friction.

Where it fits

Outlook is the inbox and calendar layer of a Microsoft stack. It is fed by your domain and your Microsoft 365 licence, and it feeds the tools that read email and calendars: your CRM, your meeting tools and your assistants.

HubSpot can integrate Outlook to send and log emails, and Folk syncs people and companies from it. It sits next to Microsoft Teams for meetings and chat, and it is the Microsoft counterpart to Gmail and Google Calendar.

What stands out

• A documented mail, calendar and contacts API through Microsoft Graph.
• Official Work IQ Mail and Work IQ Calendar MCP servers, so AI agents can read, search and draft email and manage events.
• A free account for personal use, so you can test the client before you buy.
• Copilot features for summaries, drafting and coaching inside the inbox.

My take

I'd pick Outlook when the company is already on Microsoft 365. Then it costs you nothing extra to adopt and it fits the rest of the suite. I'd also keep it in mind for any team that deals with large organisations, since those still run on it.

I'd skip it when you are a Google Workspace shop with no reason to switch. Gmail and Google Calendar do the same job with less friction there. What I'd watch is licensing: the plan you need depends on whether you want business email, Copilot and the AI integrations.

Verdict

Pick it when your company or your customers run on Microsoft 365 and you want a client that connects to the rest of the suite. Skip it when your team is on Google Workspace and has no reason to change.