we like to start with Intune. Can I create a software inventory from the clients (windows 10 and 7)? I like to inventory also the software which is not installed over the company portal or packed in Intune.
one approach to doing this would be to use the Intune Data Warehouse, see https://docs.microsoft.com/en-us/intune/reports-nav-create-intune-reports.
To get the Windows 7 info, you will need to use SCCM in conjunction with Intune