Add Microsoft to the growing list of companies with their own "Appstore." Microsoft recently announced their new Appstore (Apple is suing them over the name) which features Apps and professional services that extend their cloud based Office offering. Most notably this includes the SharePoint cloud offering. Given SharePoint's need for customization, which is constrained in the cloud version, this offering makes quite a bit of sense. As with Apple's App store, Apps submitted to the store are required to meet stringent requirements and evaluation to ensure security and stability.
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(submitted by Bharath)