Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of virtualization specialist Citrix Systems (Nasdaq: CTXS) are sinking today, down by as much as 10%, after tech bellwether Oracle (Nasdaq: ORCL) reported uninspiring earnings last night.

So what: The gloomy figures have triggered a broad sell-off within technology companies due to concerns over business technology spending. Oracle said its customers didn't mention reduced budgets, but that hasn't stopped software investors from fearing the worst.

Now what: Other tech stocks getting hammered include CommVault Systems (Nasdaq: CVLT) and TIBCO Software (Nasdaq: TIBX), along with fellow virtualization player VMware (NYSE: VMW). Days like this are buying opportunities, pure and simple. Even if the fears of slower spending in the short term are justified, virtualization is a long-term winner as everything moves into the cloud.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.