Connecting to your personal Exchange/Outlook Calendar

OnceHub communicates with your Exchange/Outlook Calendar using the Exchange Web Services (EWS) API, a well-established official Microsoft protocol. All credentials and data traffic are fully encrypted. Learn more about how your sign-in credentials are stored and protected by OnceHub

In this article, you'll learn how to connect your OnceHub Account with your Exchange/Outlook Calendar.


Microsoft does not support Transport Layer Security (TLS) below TLS version 1.2. Learn more about how Exchange/Outlook Calendar uses TLS

Connecting to your Exchange/Outlook Calendar

  1. Sign in to your OnceHub Account. 
  2. Select your profile picture or initials in the top right-hand corner → Profile settingsCalendar connection

    Note If you are connected to any other calendar, you will need to disconnect first. Existing bookings that have not yet taken place will not be added to your Exchange/Outlook Calendar after you connect. 

  3. Click the Connect button next to Exchange/Outlook Calendar (Figure 1).
    Figure 1: Calendar connection
  4. The Connect to Exchange/Outlook Calendar pop-up will appear (Figure 2).
    Figure 2: Connect to Exchange/Outlook Calendar pop-up
  5. Enter your email address and password, as you normally would to sign into your mailbox via Outlook or any other method. Click Connect.
  6. If the connection is successful, the pop-up closes and you should see confirmation that you are connected to your Exchange/Outlook Calendar (Figure 3).
    Figure 3: Connected to Exchange/Outlook Calendar
  • If you're using Booking pages, you have the option to configure the OnceHub advanced integration settings. You can also click the Continue setup button in the What's next? section to access more options.

If your Exchange/Outlook account is set up with 2-step verification, you must create an app password first. You can then use this special password to connect your OnceHub Account to your Exchange/Outlook Calendar.

You're all set! You can now configure your Exchange/Outlook Calendar connection.

Connection issues requiring additional information

Even if your credentials are correct, the connection might not be successful due to various Exchange configurations. If you see the following screen (Figure 4), additional information will need to be provided.

Figure 4: Connect to Exchange/Outlook Calendar with additional information

In the EWS URL field enter the address of your EWS in the format:  Learn how to determine the EWS URL

The value to enter in the User name field depends on your Exchange configuration, and can be any of these three options:

  1. Leave blank—not required for many Exchange servers.
  2. Try entering your email again, which some Exchange servers accept as a user name.
  3. Enter your full Domain\UserName you would use to sign into other Windows systems:

Click the Connect button. If you're still not connected, make sure you have entered all the values as above, making sure all the formats and slashes are in the right places.

If the connection still fails, search your organization's internal knowledge base or contact your IT support, as there are many possible Exchange configurations and settings. Learn more about Exchange/Outlook connection troubleshooting

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