Microsoft has released the details on how they plan to run the apps released through the new App Store coming with Windows 8. Users can have a 7 day trail on paid apps before buying them.
Also there will be in-app purchases.
Apps can only be priced between $1.49 and $999.999. Microsoft will take either a 30%, or 20% share of each app sale. Once the application reaches a total $25,000 including sales and in-app purchases, the 20% rate will be charged thereafter.
For all other applications, Microsoft will take 30%. Apps will be allowed to have a ‘try before you buy’ system, in which users can decide after testing whether or not they want to purchase the software.