Important Information: The tender offer for the outstanding shares of ShoreTel common stock to be conducted in connection with the proposed acquisition of ShoreTel referenced in this communication has not yet commenced. At the time the offer is commenced, Mitel and its acquisition subsidiary will file tender offer materials on Schedule TO, and ShoreTel will thereafter file a Solicitation/Recommendation Statement on Schedule 14D-9 with the SEC with respect to the tender offer. The tender offer materials (including an Offer to Purchase, a related Letter of Transmittal and certain other offer documents) and the Solicitation/Recommendation Statement will contain important information. Holders of shares of ShoreTel common stock are urged to read these documents when they become available because they will contain important information that holders of ShoreTel common stock should consider before making any decision regarding tendering their shares. The Offer to Purchase, the related Letter of Transmittal and certain other offer documents, as well as the Solicitation/Recommendation Statement, will be made available to all holders of shares of ShoreTel common stock at no expense to them. The tender offer materials and the Solicitation/Recommendation Statement will be made available for free at the SEC’s web site at www.sec.gov. Copies of these documents will also be made available free of charge on Mitel’s website at investor.mitel.com or by contacting Mitel’s Investor Relations Department at 469-574-8134.