It's less expensive to use for domestic and international calls. If you have a very small business (for example, 1-2 people), using the Skype app is the better way to go. If you want to use Skype for Business to make and receive calls from people external to your business:

And you can Set up a Skype for Business meeting in Outlook to online meetings, too! For example, if your business has 10 people, you'll be able to Start using Skype for Business for IM and online meetings each other, and Meetings with Skype for Business using Skype for Business after performing the steps 2-6 below. If you have Microsoft 365 Business Premium Standard or Business Essentials, you can use Skype for Business to make online calls to other people in your business who are on your subscription. You can follow the steps in this article to get your setup completed. Looks like you need help setting up Skype with your Microsoft 365 or Office 365 subscription. If you have a firewall or proxy server that restricts access to parts of the web, consider hiring a Microsoft partner to set up Skype for Business for you. You must have global admin permissions to set up Skype for Business. Remember that a successful upgrade aligns technical and user readiness, so be sure to leverage our upgrade guidance as you navigate your journey to Teams.

If you want to upgrade your organization to Teams yourself, we strongly recommend that you begin planning your upgrade path today. If you haven't upgraded your Skype for Business Online users yet, they will be automatically scheduled for an assisted upgrade. Skype for Business Online was retired on July 31, 2021.

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