A great on premise business solution - Microsoft Windows Server 2012 Essentials.

The Cloud based version MS Office - Office 365 - includes excellent email and collaboration

Our recommended antivirus for small offices is Trend Micro, who do both server based and hosted solutions - the-it-service is a Trend partner.

Two respected free (check licensing restrictions) antivirus solutions - Avast (including a version for your Mac) and AVG.

Microsoft's own free security suite is no slouch - Microsoft Security Essentials.

For Malware try the excellent Malwarebytes - a free tool. Or Lavasoft's Ad-aware free.

Check the effectivness of your firewall using Shields Up! from Gibson Research.

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