Paychex offers a comprehensive HR outsourcing solution called One-Source Solutions that provides HR services and support. It offers one partner and solution for clients, with services including payroll, benefits administration, time and attendance tracking, and HR administration. Clients benefit from one-on-one service from dedicated representatives, centralized data management and control, flexibility to select desired services, easy to use online systems, and reliable and cost-effective services backed by Paychex's experience serving over half a million clients.