From VLDI web site. Data sheet. They do not have Linux server based. All servers for messaging are Linux based. They still say MS 2008. No mention of iOS.
From their site and their data sheet
System Requirements ValidianTM Protect Server 3.1 • Windows Server 2003/2008 or Windows Small Business Server 2003/2008 • 2 GB RAM • 80 MB disk space • Intel Pentium 4 or equivalent • Static IP address and dedicated firewall port ValidianTM Protect SDK 3.1 • Windows XP/Vista/7 • 1 GB RAM • 40 MB disk space • Intel Pentium 4 or equivalent • Visual Studio 2005 ValidianTM Protect Runtime 3.1 • Windows XP/Vista/7, Windows Server 2003/2008 or Windows Small Business Server 2003/2008 • Android 4.0.3 and greater • 512 MB RAM • 20 MB disk space • Intel Pentium 4 or equivalent
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