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WHS did you mean Windows Home Server?
Microsoft has plans to release a working Connector for Windows Server Essentials R2 for Windows 10 by the release date of Windows 10? Anyone relying on the server for backup/system support will be precluded from installing Windows 10 on clients until a working Connector is available.
If you have Windows Home Server 2011 or Windows Server Essentials 2012 (not R2)—or the related Small Business Server 2011 Essentials—there’s nothing to do, everything works. This means you can use the in-box Connector software to connect Windows 10 clients with no issues, and that built-in services such as PC backup and restore will work.
If you are running Windows Server Essentials 2012 R2, the in-box Connector software doesn’t currently work. Microsoft will “soon” release a Windows 10-compatible Connector, and release it via its Download Center web site. At first, you will need to manually install this new Connector on Windows 10 clients from the web. But Microsoft says it expects to add this new Connector to WSE 2012 R2 in October 2015.
UPDATE: Microsoft has already released the Windows 10 compatible version of the Connector software for WSE 2012 R2. –Paul