Please Yahoo keep Zimbra & Zimbra Desktop simple and don't Yahoo-ize too much... If I have to use Zimbra as my mail client for my gmail account, why would I want a "Yahoo!" or "My yahoo!" link on top of my emails... I also preferred by far the Zimbra logo to the YAHOO! <small letters>zimbra</small letters>... Not really interested in "web search" or "local search" in a mail client - and there is no way to remove all this...
Is also quite tiring (if not ridiculous) to see Yahoo write down "Yahoo! Zimbra" every time in any press release... looks a bit like the linux vs Gnu/Linux war :/
In other words, to Yahoo folks: this definitely won't make your yahoo services used more, I think they will just make Zimbra and Zimbra desktop used less. Please keep it simple and stick a "powered by Yahoo" somewhere. If I don't want to use Yahoo! I don't want my mail client to have 20 links asking me to subscribe, or pointing me to whatever service yahoo is trying to advertise :/