We have to look at this in the real world folks!!
What we have strapped to our belts is usually the best of what we have found with respect to cell phone service providers and NOT what we would like to have!! Or what was handed to us from an employer footing the bill.
Lets face it that Nokia end points are the world's largest number of customer units.
This means the we are stuck with the cable or bluetooth Nokia PC Suite or other tools that Nokia cell phones work with??
Now lets get Zimbra to talk to the largest portion of units in the world and we can take Bill Gates

out of the equation!!