Thanks for the information, but I already have that change in place. The problem is not with the logo or it's URL redirect on the splash page, but with the logo and it's URL redirect on the first application page once you have actually logged in (upper left corner).
Here's a bit more information. The problem only seems to occur with certain skins and not others. Any of the skins which show the tabs at the top such as sand the upper left logo redirect works correctly. Any of the skins that use the icons down the left side rather than the tabs at top such as steel the upper left logo redirect does not work correctly. Actually in some cases the skins with the icons down the left side some display the zimbra logo and zimbra redirect and some display our logo with the zimbra redirect.
It's rather frustrating at the moment as it seems some of the rebranding is working just fine and some is not dependent upon the skin in use.
Thanks again in advance for any help!