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2. It's always free
To be considered open source, the source code needs be freely available. That free availability does not mean the application itself is inevitably free. There are actually many companies making money from their open-source projects. Often, the suppliers tend to attach the price to areas such as support or added features. They also tend to make a community version of their product, which is free.
When a company sells a community version, it's usually a stripped-down, bare-bones variant of the commercial, open-source product. A great example of this approach is Zimbra, a powerful email and collaboration tool that offers a free, open-source edition as well as editions that have price tags and more features and less access to source.
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3. There's no support
Some open-source software offers support, sometimes at an extra cost, and some doesn't. This issue is often critical for larger companies. But even though a piece of open-source software doesn't have a corporate-friendly, 24/7 support hotline, that doesn't mean there is no support.
Sometimes, there are forums or mailing lists for support. In other cases, the developers who created or work with the software can be contacted. Support options are certainly available — even if that support might not be compatible with the corporate mindset.
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4. You need full access to the source code
Although this issue is generally not of interest to the average user, I bring it up here because it remains a significant misconception about open source. Open source does mean you have full access to the source code of a program but it doesn't mean you need that access to use the software.
This is a myth that has persisted for a long time. Just because the source is out there and available doesn't mean it's necessary. In fact, users can go their entire life using open-source software and without ever having to touch the source. But should you or your company want to modify an application, the code is there when you need it.
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