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Are you using public license or network edition? Public license does not allow you to change the logo! Network edition can change the following logos:<br />
<a href="http://www.zimbra.com/docs/ne/6.0.6/administration_guide/branding_skins_steps_5x.19.3.html" rel="ugc">http://www.zimbra.com/docs/ne/6.0.6/administration_guide/branding_skins_steps_5x.19.3.html</a>
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Are you using public license or network edition? Public license does not allow you to change the logo! Network edition can change the following logos:
http://www.zimbra.com/docs/ne/6.0.6/administration_guide/branding_skins_steps_5x.19.3.html [http://www.zimbra.com/docs/ne/6.0.6/administration_guide/branding_skins_steps_5x.19.3.html]

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Where are those logos png files located?
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Look into /img/logo/ subdirectory of your zimbra server directory.
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Look into /img/logo/ subdirectory of your zimbra server directory.

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This is using zcs 6.0.10. My management wants to change the logon logos into our company logo, how to do it?
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This is using zcs 6.0.10. My management wants to change the logon logos into our company logo, how to do it?

how to change the logon logos in zimbra?

The variety of Linux distributions creates myriad issues relating to configuration and operations when computers are networked, not the least of which is the use of various network management applications, some of which are included with specific distributions, while others are standalone applications.