1. ShoreTel Brilliantly simple business communication Your Name Your Title Month XX, 20XX

2. © 2010 ShoreTel, Inc. All rights reserved worldwide. Company information 1 Founded Superior technology designed from a clean sheet of paper in 1996 Headquarters Sunnyvale, California with offices in Austin, Texas, UK, Germany, Spain, Australia, Singapore and Hong Kong Customers More than 13,000 globally Distribution Sold through resellers and distributors worldwide Ownership Public, listed on NASDAQ (“SHOR”) No debt, positive cash flow

3. © 2010 ShoreTel, Inc. All rights reserved worldwide. A global reputation for excellence Customers in 35 countries Winner of many industry awards for customer satisfaction and product innovation Best overall VoIP provider by Nemertes Research for the last seven years in a row More than one million licensed users to date Great collaboration with world leaders: IBM, AT&T, Verizon, Telstra, Qwest and the list goes on 48 percent annual compound growth, positive cash flow 2

4. © 2010 ShoreTel, Inc. All rights reserved worldwide. Simple, effective philosophy 3 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 brilliantly simple approach to everything COMMITTED TO VALUE WITH RAPID ROI FOR CUSTOMERS

5. © 2010 ShoreTel, Inc. All rights reserved worldwide. One brilliantly simple solution for the way you work 4 Business Communication Solution Unified Communications IP Phone SystemContact Center

6. © 2010 ShoreTel, Inc. All rights reserved worldwide. One brilliantly simple solution for the way you work Business Communication Solution Unified Communications IP Phone SystemContact Center Unifying rich communication capabilities into a modular design that scales and integrates with ease

7. © 2010 ShoreTel, Inc. All rights reserved worldwide. One brilliantly simple solution for the way you work Business Communication Solution Unified Communications IP Phone SystemContact Center Unifying rich communication capabilities into a modular design that scales and integrates with ease Integrating voice, video, and data across any device to streamline collaboration and enhance productivity

8. © 2010 ShoreTel, Inc. All rights reserved worldwide. One brilliantly simple solution for the way you work Business Communication Solution Unified Communications IP Phone SystemContact Center 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

9. © 2010 ShoreTel, Inc. All rights reserved worldwide. IP Phone System One brilliantly simple solution for the way you work 8 Business Communication Solution All-in-One Contact Center Unified Communications

10. © 2010 ShoreTel, Inc. All rights reserved worldwide. Powerful capabilities easily unleashed 9 Intuitive to use/manage Raises productivity Frees up IT resources Purpose-built for IP Highly versatile & reliable Ideal for business agility

11. © 2010 ShoreTel, Inc. All rights reserved worldwide. When business communication is brilliantly simple 10 Experience Free-Done: the freedom to get things done

12. © 2010 ShoreTel, Inc. All rights reserved worldwide. The rewards of ease-ability 11 EASY TO DEPLOY EASY TO LEARN EASY TO USE EASY TO MANAGE EASY TO SCALE

13. © 2010 ShoreTel, Inc. All rights reserved worldwide. And brilliantly simple has a unique architecture Built from the ground up for IP, not through acquisition like our competitors Distributed architecture delivers high reliability and lowest total cost of ownership A single image architecture is unique, allows businesses to be served by a single communication system unifying the enterprise Easily managed from anywhere with ShoreTel Director: an intuitive browser-based interface that unifies everything Applications are distributed and can run from anywhere in the system

14. © 2010 ShoreTel, Inc. All rights reserved worldwide. 13 Designed for maximum availability Provides 99.999 percent (five-nines) availability for mission critical communications Reliability is inherently built into the system using solid state switching technology In the event of a WAN failure, switches continue to work independently In the event of a switch failure, n+1 redundancy ensures it rolls over to an available switch on the network

15. © 2010 ShoreTel, Inc. All rights reserved worldwide. And it is an open platform for business agility Works seamlessly in any business environment, integrating: Enterprise applications such as Microsoft Dynamics CRM, Salesforce.com and NetSuite Custom-built applications via the platform’s open application programming interface (API) Third-party phones Even other UC/UM platforms, such as IBM Lotus Sametime, Microsoft OCS, and others 14

16. © 2010 ShoreTel, Inc. All rights reserved worldwide. It’s not just about savings: it’s also about the gains 15 Great customer experience Impactful communication Dynamic collaboration Productive workforce Low purchase cost Low deployment cost Low operating cost Low growth cost

17. © 2010 ShoreTel, Inc. All rights reserved worldwide. Source Data: Ferris Research, Inc., Wainhouse Research, Nemertes Research, Alinean Research, The Tolly Group A close look at TCO with ShoreTel 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 16 0 5 10 15 20 25 30 $M 16 Avaya MitelCisco MicrosoftShoreTel Implementation and training Capital cost for network upgrade Capital cost for telephony system TDM $15.01 $14.20 $19.60 $19.17 $6.72 $26.37 Long distance charges Network costs Electricity consumption System management, MACs, downtime Support services

18. © 2010 ShoreTel, Inc. All rights reserved worldwide. ShoreTel UC Platform – Software Distributed call control software Single, unified system – management ease Reliable, stand-alone services in all locations N+1 redundancy built into architecture Rich software applications Unified messaging and auto-attendant Contact Center and IVR IM, audio, desktop video, Web conferencing 17 ShoreTel UC Platform ShoreTel IP Phones ShoreTel User Applications ShoreTel System Management ShoreTel Open Integration ShoreTel Services

19. © 2010 ShoreTel, Inc. All rights reserved worldwide. ShoreTel UC Platform – Hardware Highly reliable voice switches Flash memory—the only moving part is the fan Modular design that’s easy to scale Call control, messaging, auto-attendant Flexible modules selected by capacity Secure, WAN access appliances VPN Concentrator SIP Session Border Controller 18 ShoreTel UC Platform ShoreTel IP Phones ShoreTel System Management ShoreTel Services ShoreTel User Applications ShoreTel Open Integration

20. © 2010 ShoreTel, Inc. All rights reserved worldwide. ShoreTel IP Phones IP Phones The latest ergonomic designs Superior sound quality Models for all user needs and types Preconfigured for ShoreTel UC 19 ShoreTel UC Platform ShoreTel IP Phones ShoreTel System Management ShoreTel Services ShoreTel User Applications ShoreTel Open Integration

21. © 2010 ShoreTel, Inc. All rights reserved worldwide. ShoreTel User Applications ShoreTel Communicator Single application for all users: workers, operators, assistants, road-warriors, and contact center Communication managed easily & intuitively Quickly find and dial contacts Dial numbers from applications or web pages Move effortlessly between voice, video & IM 20 ShoreTel UC Platform ShoreTel IP Phones ShoreTel System Management ShoreTel Services ShoreTel User Applications ShoreTel Open Integration

22. © 2010 ShoreTel, Inc. All rights reserved worldwide. ShoreTel System Management ShoreTel Director Entire IP phone system managed from a single, browser-based interface Intuitive administration Requires minimal training Needs fewer IT resources 21 ShoreTel UC Platform ShoreTel IP Phones ShoreTel System Management ShoreTel Services ShoreTel User Applications ShoreTel Open Integration

23. © 2010 ShoreTel, Inc. All rights reserved worldwide. ShoreTel Managed Solution Turnkey Unified Communications Managed Service Per-seat monthly subscription service for full IP telephony No capital outlay Supports changing business conditions Obsolescence protection Out-tasking that keeps you in control 22 ShoreTel UC Platform ShoreTel IP Phones ShoreTel System Management ShoreTel Services ShoreTel User Applications ShoreTel Open Integration

24. © 2010 ShoreTel, Inc. All rights reserved worldwide. ShoreTel Open Integration Open Integration Enterprise applications seamlessly integrate into the system Out-of-the-box implementation User productivity & efficiency greatly enhanced Open API for custom integrations 23 ShoreTel UC Platform ShoreTel IP Phones ShoreTel System Management ShoreTel Services ShoreTel User Applications ShoreTel Open Integration

25. © 2010 ShoreTel, Inc. All rights reserved worldwide. 24 ShoreTel Services Service, Support and Training World-class commitment to excellence Highest customer satisfaction levels Sets the industry standard Global 24/7 support ShoreTel UC Platform ShoreTel IP Phones ShoreTel System Management ShoreTel Services ShoreTel User Applications ShoreTel Open Integration

26. © 2010 ShoreTel, Inc. All rights reserved worldwide. Customer satisfaction is our mission Strict Rules for Serious Results  4-point scale  Conducted by third party Fiscal Year Ranking World Class 90.7391.9492.0792.9590.3294.4291.4393.0193.5894.6193.8692.5293.17  All results included  Everyone is measured — partners and employees alike

27. © 2010 ShoreTel, Inc. All rights reserved worldwide. Number 1 for 7 years running – Nemertes Research 26 ShoreTel IP Telephony: All Vendors, Overall Scores Nemertes Research, PilotHouse Awards - Top Providers, IP Telephony, Fall 2010

28. © 2010 ShoreTel, Inc. All rights reserved worldwide. COMPETITORS HARDWARE + Switch-based – Server-based (disk drives) Making innovation work for you 27 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

29. © 2010 ShoreTel, Inc. All rights reserved worldwide. ShoreTel’s brilliantly simple solution Garnering the highest customer satisfaction ratings in the industry Purpose-built for IP—unlike the complex, resource-heavy alternatives on the market An all-in-one IP phone system with built-in UC and contact center capabilities A rare combination of low purchase cost and unparalleled low ongoing costs for the lowest TCO in the industry A unique distributed architecture that’s easy to deploy, manage and scale Easy to learn and use for your employees to exploit the full power of IP communication and collaboration to maximize productivity World class customer support and training