Hi all,
This got me worried, as I have bought an RX4100 with Windows Storage Server 2008 R2 Essentials on it.
According to Microsoft at http://support.microsoft.com/lifecycle/search/?alpha=Windows , Windows Storage Server 2008 R2 Essentials leaves Mainstream support 13/01/2015.
But it has extended support (which means security updates) until 2020, which will do me fine.
I hope that this is useful.
Regards,
Tony