The UK's biggest digital television platform commercially launched a new high definition service in March 2010, initially seeing relatively modest sales of receiver equipment, taking just under a year to pass 1m.
But the service appears to be hitting its stride as the UK gears up for a 2012 packed with live sport, including the London Olympics and Euro 2012.
In the final three months of 2011, sales of Freeview HD set top boxes and TVs hit 1.3m, helping the number of Freeview HD units sold in total to pass 4.4m by the end of December.
Year-on-year sales of Freeview HD televisions more than doubled last December, and Freeview+ HD equipment, which enables users to pause and rewind live television, now accounts for 30% of all Freeview+ sales.
According to data from BARB, around 2m homes are actively using the subscription-free HD service since it launched 18 months ago, an achievement which Freeview noted was made in "half the time it took Sky HD to reach a comparable user base".
Of all the internet-connected Smart TVs sold last year, 90% were Freeview HD sets, allowing users to watch the main HD networks offered by the BBC, ITV and Channel 4, as well as access video on-demand and web services.
Freeview managing director Ilse Howling said that 2012 is a key year for Freeview as the platform reaches its tenth anniversary, and the digital TV switchover will be completed in October.
"2012 is set to be a landmark year for the television industry and we have entered it with a bang as a result of fantastic Freeview HD sales figures," she said.
"Television remains an incredibly important part of people's lives and Freeview has continued to provide the most-loved programmes in the format people want without the need to pay for a subscription.
"Our focus now is to ensure we continue to evolve the service and give viewers what they want over the next ten years."
Currently 81% of the UK can receive Freeview HD, but that will increase to 85% by the Olympics and virtually the whole of the UK by the end of the switchover.
Freeview HD offers four HD channels - BBC One HD, the BBC HD Channel (due to turn into the BBC Two HD under BBC plans), ITV1 HD and Channel 4 HD - but a fifth channel is scheduled to launch in April 2012.
Channel 5 was expected to take the fifth HD channel slot on Freeview, but Richard Desmond's broadcaster has opted against the launch.
This means that the capacity has been handed back to the BBC to decide what to do with the available channel slot, and we are currently awaiting more announcements on this.
> Freeview MD: 'Gloves are off after digital switchover'