Hi Alex Wang112！
If you want to upgrade to Skype for Business 2015, you can use the new In-Place Upgrade feature. 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. There are two scenarios for In-place upgrade: Move user method (no downtime for user), Offline method (require downtime).
The following steps show how to upgrade from Lync Server 2013 to Skype for Business 2015:
- Back up all databases before the upgrade.
- Make sure all services that are to be upgraded are in a running state.
- Upgrade and publish the topology file using the topology builder.
- Stop all services on all Front End servers.
- Install new prerequisites required for Skype for Business Server.
- On each Front End server, start the In-Place Upgrade.
- When the upgrade is complete, restart all services.
For more details, please refer to:
https://docs.microsoft.com/en-us/skypeforbusiness/plan-your-deployment/upgrade#plan-to-upgrade-from-lync-server-2013-to-skype-for-business-server-2015
Best Regards,
Jimmy Yang
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