Microsoft launched Office for iPad just a week ago and the suite of productivity apps have together tallied 12 million downloads so far, the company said in a tweet on Thursday. The apps are free to download and those who want to read or present documents using those apps can also do so for free. But those who want to create or edit in Word, Excel or PowerPoint must purchase an Office 365 subscription. (OneNote does not require an Office 365 subscription to create or edit.) Microsoft declined to say how many Office 365 subscriptions it has sold via Office for iPad in-app purchases or to users of Office for iPad as a whole. ”We’re extremely pleased with the Office for iPad interest we’ve seen from consumers and business alike. We have no additional details to share,” the company said in a statement.