Microsoft just announced a new Cloud Storage Partner Program for Office, enabling third-party storage providers such as Box, Citrix ShareFile and Salesforce to connect their services to Office Online for document viewing and editing.

This follows a previously announced partnership with Dropbox.

The company also announced that integration with Office for iPad and iPhone is also available for third-party storage providers via an open API.

“Starting today, third-party cloud storage providers can natively integrate into the ‘Locations’ picker in the iOS Office apps,” says the company in a blog post. “This will enable users to open, edit and save documents from these providers right from within Office. While we’re announcing availability of the iPad and iPhone integration today, we’re hard at work on the same type of integration for the Office universal apps for Windows 10 and the Office for Android apps. So in the future, no matter what device, platform, or storage provider you’re using, your Office documents will only be a tap away.”

“Partners that share our passion for boundless productivity can now bring more storage choice and flexibility to our mutual customers,” a spokesperson for Microsoft told us in an email. “Both announcements advance Microsoft openness and continue to drive forward a long-term vision for even greater Office extensibility.”

Office for iPad and iPhone have seen over 80 million downloads to date.

Image via Microsoft