Vianet Group plc

Sales update

The Board of Vianet announces that new installations to Glaxosmithkline plc ("GSK") for this calendar year will be materially lower than previously expected which, in the absence of material additional sales from other sources, will in turn result in a shortfall in Group revenues against current forecasts. The Company is in the final stages of negotiating a new long term purchase contract with GSK and agreeing terms for the immediate drawdown by GSK of scheduled deliveries to date. A further update will be provided when the annual results for 2007 are announced at the end of June.

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