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But you can’t run both Lync Server 2013 and Lync Server 2010 in the same topology as Skype for Business Server

Support for coexistence – You can run Skype for Business Server in the same topology as Lync Server 2013 or Lync Server 2010.

After running In-Place Upgrade install the new LRS Admin tool The LRS Admin Tool for Lync Server 2013 cannot coexist with Skype for Business Server 2015.

Be sure to uninstall LRS Admin tool for Lync Server 2013 before running In-Place Upgrade.

To learn how to do this, see Setting up Kerberos authentication

If you use Kerberos authentication for Web Services, you must reassign Kerberos accounts and reset the password after the In-Place Upgrade is complete.

Upgrade all your pools first, then the edge servers, and finally the Central Management Store (CMS) pool

Upgrade the topology from the inside to the outside.

Skype for Business Server doesn’t support having only a portion of the pool upgraded

Once you start to upgrade a server pool, you must complete the upgrade of the entire pool.

If you have paired pools, do not unpair them before the upgrade.

Skype for Business Migration Step by Step (From Lync 2010 or Lync 2013)Ĭheck out my article The finer details of a Skype for Business In-Place Upgrade to learn more about the upgrade process and things you should consider.

Skype for Business Deployment Step by Step (Greenfield Deployment).

To learn more about the other deployment options see the following articles: If you have a purely Lync 2010 environment, you can migrate directly to Skype for Business. If you have OCS you will first need to migrate to Lync 2013, then decommission the old servers before upgrading. In-place upgrade seeks to preserve existing hardware and server investments, reducing the overall cost to deploy Skype for Business Server 2015.

In-place upgrade provides a one-click solution that backs up certificates, uninstalls server components, upgrades local databases, and installs the Skype for Business Server 2015 roles. If you have a purely Lync Server 2013 environment you can upgrade to Skype for Business Server 2015 using the new In-Place Upgrade feature.