Decommission legacy pools needs the following 7 steps:
- Update DNS SRV records
- Move the Lync Server 2010 Central Management Server to Lync Server
- Move Conference Directories
- Remove the Archiving server association
- Remove the Monitoring server association
- Remove the Enterprise Edition Front End Server or Standard Edition Front End Server
- Remove SQL Server instances and databases on the Back End Server
For more details, please refer to this article.
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