​What are the MS Project supported versions? 

The following Microsoft Project file formats are supported: Microsoft Project files 2010, Microsoft Project files 2013, Microsoft Project files 2016, Microsoft Project 2019 and Microsoft Project 2021. In this way, you don't need to have Microsoft Project installed on your device so that you can access MS Project information.

How do I check the version of Microsoft Project that I use? 

In case of Microsoft Project 2016 and 2013, this value is located in the Account menu from the File backstage. In case of Microsoft Project 2010, this value is located in the Help menu from the File backstage.

How do I check the version of Project Plan 365 app that I use? 

To check the version of Project Plan 365 that you use, please go to menu Help-About dialog.

I have a mpp file created with Microsoft Project and in Project Plan 365 there are some differences. Shouldn't it be compatible? 

Project Plan 365 aims to be compatible with the latest updates and versions of Microsoft Project. If you open the file in Project Plan 365 and notice differences you need to update the latest version of Microsoft Project.

What versions Project Plan 365 app support for opening?  

Project Plan 365 will open any MPP file created with MS Project versions as early as 1998.

What versions Project Plan 365 app support for saving? 

The MPP files saved with Project Plan 365 are compatible with Microsoft Project 2010 and newer versions.