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If for complete computing environment:
• Networking: Wired, Wireless, IP, DHCP, etc.
• Printing: Printers, paper, queues, easy setup and access
• Backup: Easy to use, non-intrusive backup, that provides full self-services
• Security: Anti-virus, anti-phishing, best practices, patching
• OS & Applications: Installation, setup, configuration, licensing.
• - Could be boiled down to OS, Web, Mail, and Office-like suite..
• File Storage: Easily accessible (SMB, HTTP, AFS, etc. ), reliable, backed-up
• Training and Documentation
• Support