Note! The Microsoft Office Online integration is available for all Jottacloud users. Personal users have access to Microsoft Office Online without the need for any Microsoft subscription.
Business users require a Microsoft subscription to Edit files online. Viewing and downloading of files are always available to all users.
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The first time a business user tries to open an Office document in Jottacloud, they will automatically be presented with the Microsoft Authentication Dialoge onscreen, and they must confirm that they have an active Office 365 subscription. Follow the onscreen instructions to authenticate your Office 365 subscription. Once completed, they can freely use Office Online in Jottacloud.

 If you don't have a commercial work or school subscription for Office 365, you can purchase one here.

Microsoft Office Online is the web-based versions of Microsoft Word, Excel, and PowerPoint. With Microsoft Office Online you can view and edit Office documents without needing Office installed on your desktop. Jottacloud is directly integrated with Microsoft Office Online allowing for a seamless experience when editing Jottacloud documents in Microsoft Office Online.
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Office Online includes support for the following apps:

To open office documents, simply select the document in Jottacloud and click Open in Word/Excel/PowerPoint Online:

This opens the document with Office Online in Edit mode. From here you can edit the document as needed. Changes you make are automatically saved:

When you are finished  editing your document, you must exit Office Online and return to Jottacloud.

To exit Office Online and return to Jottacloud, click on the File menu and select Exit from the menu. This will bring you back to the document folder in Jottacloud. Your document is already automatically saved:

You can also click the "Save and return to Jottacloud" link in at the top of Office Online:

All changes you make in office online are saved automatically as you type. But a new version of the document in Jottacloud is only created when you EXIT Office Online and return to Jottacloud.