Submitted for your perusal is the sophistication of technology in a small to medium-sized businesses. Can one "tech guy" who comes in twice a month have the requisite knowledge and expertise to cover it all?

• Email and messaging (Exchange/Outlook, Blackberries and other mobile devices)
• Office software
• Printers/Scanners
• Remote access (Citrix, VPN, Terminal Services)
• Internet Access
• Firewall
• Storage
• Backup & Recovery (Tape, Disk, Online)
• Threat reduction (antivirus, spam filtering)
• Patch management
• Monitoring

Then throw in industry-specific and specialized applications like docketing, document management, accounting and finance, sales, CRM, and custom databases. Even more, on the horizon even small firms will have some form of server virtualization, online backup, and enhanced mobile communications.

Needless to say, this is too much for one person to handle. Best would be to have a medium-sized IT company managing your firm's IT. That company will assign an engineer representative for site visits and be the point of contact who intimately knows the client's system, but can call on specialists and experts whenever necessary.