1. ShoreTel Brilliantly simple business communication

2. Company information Founded Superior technology designed from a clean sheet of paper in 1996 Locations Headquarters in Sunnyvale, California with offices Austin, Texas, and the UK, Germany, Spain, Australia, Singapore and Hong Kong Customers More than 11,000 globally Distribution Sold through resellers and distributors worldwide Ownership Public, listed on NASDAQ (“SHOR”) No debt, positive cash flow

4. Strong Annual Revenue Growth ($ in millions) __________ Note: fiscal year ended June 30. CAGR calculated based on full (non-rounded) numbers. CAGR 48%

5. Simple, effective philosophy Obsessively driven to deliver the best customer experience RAVING FANS GIVE HIGHEST SATISFACTION RATINGS Making innovation truly work PURPOSE-BUILT FOR THE POWER OF IP A straight forward approach to everything COMMITTED TO VALUE WITH RAPID ROI FOR CUSTOMERS

6. One brilliantly simple solution for the way you work Business Communication Solution Unified Communications IP Phone System Contact Center

7. One brilliantly simple solution for the way you work Business Communication Solution Unifying rich communication capabilities into a modular design that scales and integrates with ease Unified Communications IP Phone System Contact Center

8. One brilliantly simple solution for the way you work Business Communication Solution Unifying rich communication capabilities into a modular design that scales and integrates with ease Integrating voice, video, data across any device to streamline collaboration and enhance productivity Unified Communications IP Phone System Contact Center

9. One brilliantly simple solution for the way you work Business Communication Solution Unifying rich communication capabilities into a modular design that scales and integrates with ease Integrating voice, video, data across any device to streamline collaboration and enhance productivity Combining flexible yet sophisticated multimedia contact center capabilities, to empower agents anywhere Unified Communications IP Phone System Contact Center

10. One brilliantly simple SINGLE PLATFORM solution Business Communication Solution All-in-One IP Phone System Contact Center Unified Communications

11. Powerful capabilities easily unleashed Intuitive to use/manage Raises productivity Frees up IT resources Purpose-built for IP Highly versatile & reliable Ideal for business agility

12. When business communication is brilliantly simple Experience Free-Done : the freedom to get things done

13. The rewards of ease-ability DEPLOY LEARN USE MANAGE SCALE EASY TO EASY TO EASY TO EASY TO EASY TO

17. It’s not just about savings: it’s also about the gains Great customer experience Impactful communication Dynamic collaboration Productive workforce Low purchase cost Low deployment cost Low operating cost Low growth cost

18. A closer look at total cost of ownership (TCO) Capital cost for telephony system Capital cost for network upgrade Implementation Training & support Moves, adds & changes Telephony system management Network cost Electricity cost ShoreTel Mitel Avaya Nortel Cisco TDM 0 2 4 6 8 10 12 14 16 18 20 $M TCO comparison of Major UC System Vendors (Pre-tax) 10 Year analysis based on VoiceCon standard large enterprise configuration: 1,500 users across 3 sites Source Data: Nemertes Research, Ailean Research, EPA. $8.67 $9.83 $11.07 $11.80 $13.89 $16.25

26. Number 1 for six years running – Nemertes Research Nemertes Research, PilotHouse Awards - Top Providers, IP Telephony, Fall 2009 ShoreTel

27. Making innovation work for you COMPETITORS HARDWARE + Switch-based – Server-based (disk drives) SOFTWARE + Distributed – Centralized MANAGEMENT + Single, intuitive web-based interface – Disparate systems END-USER FUNCTIONALITY + Seamless and consistent across locations – Inconsistent features across locations REDUNDANCY + N+1 – 2N, duplicate systems SCALABILITY + Modular – Forklift upgrades SERVER DEPENDENCY + Low – High EASE-OF-USE + Brilliantly simple – Unintuitive and complex TOTAL COST OF OWNERSHIP + Low – High

28. ShoreTel Brilliantly simple