Integrations · Calendar
AI receptionist for Microsoft 365 / Outlook
The short answer
Yes. FirstVoice connects to your Microsoft 365 calendar, checks when you're free and books appointments into Outlook during the call.
Last updated
Try it
Watch a call go into Microsoft 365 / Outlook.
Incoming call
Example caller · Mobile
An example call, sped up. Your setup follows your own questions and rules.
- A caller asks for an appointment
- FirstVoice checks your work calendar for real free time
- It books the appointment into Outlook, with the caller's details and notes
- It confirms the time with the caller and can text a confirmation
- Changes and cancellations are updated in Outlook too
FirstVoice with Microsoft 365 / Outlook
Appointments land straight in Outlook.
What happens on a call
- A caller asks for an appointment
- FirstVoice checks your work calendar for real free time
- It books the appointment into Outlook, with the caller's details and notes
- It confirms the time with the caller and can text a confirmation
- Changes and cancellations are updated in Outlook too
Getting connected
- You sign in with Microsoft once to connect. If your business has an IT admin, they may need to approve it
- We set up and test everything, and you can disconnect it any time
Nothing changes for your team
You keep Microsoft 365 / Outlook exactly as it is. Your team, your phone number and the way you work don't change. FirstVoice simply answers the calls you can't, and puts the results into Microsoft 365 / Outlook.
Technical details, for whoever looks after your software
FirstVoice with Microsoft 365 / Outlook
| Check availability during the call | Yes |
|---|---|
| Create bookings, jobs or leads | Yes |
| Recognise returning callers | No |
| Add call notes and summaries | Yes |
| Trigger follow-up texts or emails | Yes |
Microsoft 365 / Outlook connection details
| Category | Calendar |
|---|---|
| Markets | Global |
| API documentation | Public view docs |
| Auth | OAuth 2.0 |
| Access | Self-serve: you can create API credentials |
| Zapier | Yes |
| Make | Yes |
| Webhooks | Yes |
| FirstVoice plan | Every plan |
| Checked | Against official Microsoft 365 / Outlook documentation, 17 September 2026 |
Entra app; application permissions need admin consent (permissions); 4 concurrent requests per mailbox (throttling)
Microsoft 365 / Outlook questions
Does FirstVoice work with Microsoft 365 / Outlook?
Yes. FirstVoice connects to your Microsoft 365 calendar, checks when you're free and books appointments into Outlook during the call.
Do I have to change anything in Microsoft 365 / Outlook?
No. FirstVoice books into your existing Microsoft 365 calendar. You don't change how you use Outlook.
Which plan includes Microsoft 365 / Outlook?
Microsoft 365 / Outlook booking is included on every plan.
Microsoft 365 / Outlook is a trademark of its owner. FirstVoice isn't affiliated with Microsoft 365 / Outlook.
Using Microsoft 365 / Outlook? Let's connect it.
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