Upgrade from a Skype for Business hybrid deployment to Teams

Stages of the upgrade journey, with emphasis on the Deployment and Implementation stage.

This article is part of Deployment and Implementation stage of your upgrade journey. Before proceeding, confirm that you've completed the following activities:

Follow the guidance in this article if you've deployed Skype for Business or Microsoft Lync on-premises and configured it in a hybrid deployment with your Microsoft 365 or Office 365 organization, and your organization wants to upgrade to Teams either selectively—by using multiple coexistence modes—or all-in. For either upgrade journey, you need to move your users to Skype for Business Online (if they aren't already homed online) and then assign them the appropriate coexistence and upgrade mode.


Having the option to upgrade doesn’t necessarily mean your organization is ready for this change. For the best user experience, confirm that Teams meets your collaboration and communication requirements, make sure that your network is ready to support Teams, and implement your user readiness plan before upgrading users to Teams.

Step 1: Move users to Skype for Business Online

This step applies to users who are currently homed on-premises. For more information about moving these users to Skype for Business Online, see Move users from on -premises to Skype for Business Online.

Step 2: Assign a coexistence and upgrade mode

After you've moved your users to Skype for Business Online, you can assign them the appropriate coexistence mode based on the upgrade journey that your organization has chosen. For more information, see Setting your coexistence and upgrade settings and TeamsUpgradePolicy: managing migration and coexistence.


With Skype for Business Server 2019 and a future cumulative update of Skype for Business Server 2015, you'll be able to perform Step 1 (moving users to Skype for Business Online) and Step 2 (upgrade users to Teams) in a single step. More information will be provided after Skype for Business Server 2019 is released.

Phone System and Teams upgrade

If you're transitioning your Skype for Business hybrid deployment to Phone System with Calling Plans and Microsoft will be your public switched telephone network (PSTN) provider—and assuming that you've completed the phone number porting—upgrading your users to Teams will automatically transition inbound PSTN calling to Teams.

If Calling Plans isn't available or you intend to use your existing PSTN connectivity provider, you need to transition your enterprise voice deployment—or hybrid voice deployment that uses your existing on-premises deployment or Cloud Connector Edition—to Microsoft Phone System Direct Routing. To upgrade your users to Teams, see the additional considerations for Phone System Direct Routing.