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

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

Upgrade from a Skype for Business on-premises deployment to Teams

Follow the guidance in this article if you’ve deployed Skype for Business or Microsoft Lync on-premises and your organization wants to upgrade to Microsoft Teams either selectively—by using multiple coexistence modes—or all-in.


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: Deploy hybrid connectivity

The key prerequisite for upgrading your users to Teams is to deploy hybrid connectivity.

For more information, see Deploy hybrid connectivity between Skype for Business Server and Skype for Business Online

Step 2: Implement your chosen upgrade journey for your organization

After you’ve completed your hybrid setup, you can plan to move your users to Office 365.

For more information, see:

Phone System and Teams upgrade

Transitioning from on-premises phone systems to Teams will allow you to take advantage of Phone System Direct Routing (“Direct Routing”) or the Microsoft-provided Calling Plans for Office 365.

If you're not using Calling Plans in Office 365, you need to transition your enterprise voice deployment to Phone System Direct Routing as part of your upgrade to Teams.

For more information, see additional considerations for Phone System Direct Routing. If you are planning to use Calling Plans in Office 365, please refer to our guidance for transferring your phone numbers to Office 365.