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Research firm Slice Intelligence has analysed the email receipts of almost 10,000 shoppers concluding that Apple saw pre-orders of almost 1 million Apple Watches on April 10th



From Neowin:
Pre-orders for the Apple Watch opened on April 10th and quickly sold out causing shipping dates for some models to fall to much later on in 2015. Apple is yet to release any kind of numbers surrounding pre-orders, except for a statement from Tim Cook, Apple CEO, describing the order volume as "great".

Luckily, there are other ways to estimate pre-order volume, one of those being by confirmation emails in inboxes. Slice Intelligence, a firm that tracks e-commerce spending through email receipts, is claiming that a little under 1 million Apple Watches have been pre-ordered according to their sample of 9,080 shoppers who agreed to have their email monitored for receipts.
  Apple received 1 million Watch pre-orders with the Sport model being most popular