Opening Windows ...

Software and Services from SerNet

SerNet produces the most important commercial open source alternative to Microsoft Windows: SAMBA+.
It serves both as Identy and Access Management solution (IAM) for Microsoft's Active Directory and as high performance SMB server with a wide range of cluster support options (Ceph, GlusterFS, Spectrum Scale and more).
SAMBA+ is available for Enterprise Linux and IBM AIX as software subscription with a wide range of support options including service level agreements (SLA) all around the clock and in every time zone.
SerNet supports open source Samba for more than 25 years and has a long track record with OEM customers and end users from startups to Fortune 500 companies.

more info at samba.plus