Yes I do. It's called the United States Postal Service. It was founded in 1775. Given its track record, I think the government could implement a digital system that will be good for another couple hundred years.
Private market has already found out the solution. Email, facebook, twitter.
The public sector has its share of successes as well. How about the postal service, the census, and national elections? The US government has been handling large scale projects since the 1700s.
And if you think that USPS (or any government organization for that matter) can do a better job hosting free email than Google, Yahoo or Microsoft (they all provide free email), I have serious questions about your sanity.
Hrm, well lets think about what happened when we privatized part of our elections (Diebold) or our defense (Blackwater). Let's compare that to the USPS which has been running successfully for over 2.5 centuries. Damn right the government can handle some problems better than the private sector. Diebold is an gross embarrassment to this country and you're fooling yourself if you think similar things wouldn't happen with a privatized postal service. The government doesn't need to have a technically superior product to Gmail, just as the USPS doesn't need to have a superior product to UPS (hint: UPS is better). The government simply needs to provide a reliable, stable service with the privacy and civil guarantees that can only be provided by a public entity. The government cares about integrity. Diebold cares about profits, and look where that got us. Untraceable election fraud in the world's most powerful democracy.