To replace the activeCollab logo and upload your company's one instead, you just need to change the following file:

/public/brand/logo.gif

By uploading your company logo in a place of the logo.gif file you will now have different look and feel of your activeCollab setup. Please note, the preferred file type is .gif. In order to fit into the existing CSS layout the image size should be no more than 40 pixels high.

Once your company logo is uploaded, it will still have the same functionality as the activeCollab logo has now: acting as a quick shortcut to the Dashboard from every page.