Shares of Savvis Inc. (Nasdaq: SVVS) fell 25 percent in mid-morning trading after the computer network service provider cut its 2008 sales forecast.

 The Town and Country-based company now expects to report $840 million to $870 million in revenue this year, down from an earlier forecast of $910 million to $925 million. The company said customers are delaying orders, and that its network business is coming under pressure.

On average, analysts reporting to Thomson Financial expected Savvis to record $905.5 million in revenue for the year.

Goldman Sachs analyst Jason Armstrong downgraded the stock to “Neutral” from “Buy,” taking the stock off the firm’s Americas Buy List. He said Savvis’ sales capacity has been limited by an upgrade in its network business.

Armstrong reduced his price target to $18 per share from $28.

Lehman Brothers analyst Thomas Seitz downgraded the stock to “Equal weight” from “Overweight,” and Jonathan Schildkraut of Jefferies cut his rating to “Hold” from “Buy.”