Hi @jshinabe,
Which data that you would like the spreadsheet to keep for the incoming Emails from Office 365 Outlook?
In order to make it work, we need to pre-define a table within the Excel, add the corresponding fields, which are used to store the Email Data.
There is a template available for track Outlook.com email into Excel, the instruction is as below:
"
Whenever you get a new email to your Outlook.com address, track it in an Excel spreadsheet. You need to have a Table with Subject, From, CC and Received Time columns.
"
So if you would like the Office 365 Outlook to work in a similar way, then please add a table with the corresponding fields.
Note that currently only the Online services listed below support Excel connector under Microsoft Flow:

Besides, if you would like to save Email as MSG file, then currently this is not available, there is an idea submitted on this already:
Ability to extract email as MSG or EML file from various Flow mail services
Regards,
Michael