Microsoft Project® (XML) Support (In-App feature)
Project Office supports export to and import documents with Microsoft Project® (XML) format. Both Project Office and MS Project® can read and write this format.
Note: Project Office does not support export/import MPP files.
The Microsoft Project® (XML) format can be used to exchange projects with Microsoft Project® 2007, 2010, 2013 and 2016.
How to export your project to XML
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Go to File ▸ Export…
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Select desired export options: Microsoft Project® (XML) or Project Office Archive (lspz).
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Select the destination you wish to save your exported file to.
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Click Save.
File element data will be compressed and included in the XML file.
How to import your project from XML
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Go to File ▸ Open…
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Browse to the location of the XML file you want to open.
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Select the file (.xml) and click Open.
A newly opened Microsoft Project® (XML) file appears in Project Office like this:

Note: You can also open a Project XML file by browsing to the file. right-click the file, and then select Project Office app on the Open with menu.