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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Fool contributor Evan Niu holds no position in any company mentioned. Click here to see his holdings and a short bio. The Motley Fool owns shares of Oracle. Motley Fool newsletter services have recommended buying shares of TIBCO Software and VMware. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.