Updated from 12:08 a.m. EST to provide information on Microsoft and closing prices.

NEW YORK ( TheStreet) - An unknown bidder offered to acquire Quest Software ( QSFT) for $27.50 per share, trumping an already agreed upon offer.

Quest Software announced earlier this year that Insight Venture Partners was going to acquire it for $25.75 per share, or nearly $2.17 billion. Dell ( DELL) previously bid for Quest Software, but it is unknown if this new bid is from Dell.

The receipt of this superior proposal drove shares of the enterprise management software maker up 5.63% to $27.69. At mid-day, the stock reached a 52-week high of $27.75.

Facebook ( FB - Get Report) is placing ads on Zynga's ( ZNGA - Get Report) website -- a move that could help Facebook build an ad network to rival Google ( GOOG)'s AdSense.

Zynga could not be reached for comment on this article.

Shares of Facebook fell 3% to $32.06 on Monday, while Zynga climbed 1.17% to $6.07.

Research In Motion ( RIMM) stumbled, as Morgan Stanley analysts downgraded the blackberry maker from Equal-weight to Underweight with a $7 price target.

"We downgrade RIM to Underweight as we believe the only way RIM remains a viable entity is at a fraction of its current size, a transformation that erases much of its earnings power. Immediate asset sales or strategic options could unleash ~$15 per share in value, but are unlikely leaving a declining Book Value," wrote analyst Ehud Gelblum.

A RIM spokesman quashed a rumor on Monday morning that the company was considering spinning off its handset business.

Shares of Research In Motion fell sharply -- 7.61% to $9.10 -- on Monday.

Nokia's ( NOK - Get Report) shares also sank 7.98% on Monday, reaching $2.19. The stock has dropped over 54% since the beginning of the year.

Goldman Sachs lowered its forecasts for handset and smartphone global growth in 2012 based on weaker demand and inventory reductions. Handset unit growth was reduced to 4% from 10% and smartphone from 38% from 42%.

After the software giant Microsoft ( MSFT) announced the acquisition of Yammer, a social network tool for businesses, shares slipped 2.72% to $29.86.

--Written by Nathalie Pierrepont in New York.

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