Exchange 2010 OWA - Custom Login Page

Hi All,

Exchange is driving me bonkers at the moment, I want to customise our Login page page on OWA, simple I thought.

We're running Exchange 2010 Version 14.02.0342.003

So I navigate to "c:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\Owa\14.2.342.3\themes\resources"

Backup lgntopl.gif then modify it: lgntopl.gif, change it on both our Client access\Hub transport servers.

Check the site, nothing!  Its the same!  What on earth am I doing wrong. 

Is it that Exchange is using a old version of the resources folder?  If so how do I find out which its using?

Oh and yes, I have this link: http://technet.microsoft.com/en-us/library/ee633483.aspx

Thanks

Rob