As it launches — Microsoft says it will come first to a limited number of Outlook.com users over the next few weeks, and then more broadly over the next few months — it said that Stripe (using Stripe Connect) and Braintree will be among the payment processors powering the service, and Zuora, FreshBooks, Intuit, Invoice2Go, Sage, Wave, and Xero will be among the billing and invoicing services that will initially be using the feature.

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