There is great value in updating your logo and/or branding every few years. This is done mainly to convey the idea that your company can and will evolve with the changing marketplace and set your company apart from competitors in a similar industry. Obviously branding and modern design techniques are an extremely important factor within the web design process and you can check out some of the branding examples that we’ve designed on our portfolio page.
This website has a pretty good listing of many fortune 500 companies and their logo evolution over the years and how these changes represent them as a company.

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