Day-long online sale is back with new site The Click Frenzy internet sale is back, and the man running it knows if things go wrong again he'll have thousands of angry shoppers on his case. Melbourne businessman Grant Arnott last year launched the online sale to try to emulate America's wildly-popular Cyber Monday sales, giving customers a 24-hour window in November to bag an online bargain from big-name retailers. With Australia's retail sector in the doldrums through 2012, and some outlets struggling to turn a buck from internet sales, the big internet sale was seen as a novel way to encourage more local customers to shop online. But its website crashed early on, because it wasn't technologically capable of handling the volume, and left an estimated 1.7 million shoppers unable to log on or struggling with a slow website. "Our initial forecast and our promise to advertisers was that we would get around 250,000 to 300,000 customers," Mr Arnott told AAP on Thursday. But it just took off at a rate beyond our wildest expectations. Announcing plans for a second such sale on April 23, Mr Arnott said the IT infrastructure had been upgraded and the site was now ready for three million customers. The concept of the sale has pleased the Australian Retailers Association, which says some Australian retailers still trailed international rivals with online sale volumes. "We are catching up very rapidly, certainly people like Myer, David Jones are getting their websites up to scratch," the association's director Russell Zimmerman told AAP. Mr Arnott declined to say which retailers would take part in the event, but said it included some of the nation's biggest names. Australian National Retail Association CEO Margy Osmond also welcomed the second Click Frenzy sale, which is being held just over two weeks before Mother's Day. But she warned that shoppers and retailers would need real reassurance about the Click Frenzy website. "I think a number of brands and retailers were affected by the failures during the last adventure with this," she added.