Where are signatures stored for "New Outlook"

Question

I have been writing a PowerShell script that autogenerates user signatures. It currently uses Microsoft Graph and a registered App to pull user information from AzureAD to create 2 .htm files for New and Reply/Forward.

99.9% of our users are using Outlook Classic so these files are saved to the traditional place:

C:\Users\<USER>\AppData\Roaming\Microsoft\Signatures

Registry Keys are created to force them to be set as their default template:

HKCU:\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\9375CFF0413111d3B88A00104B2A6676

After hearing how Microsoft is going to eventually start forcing New Outlook on all of us, I am trying to find official documentation on where signature files are located?

After some testing, it must be somewhere in the cloud. I started making signatures in New Outlook and OWA. I am not finding anything related to signatures in my OneDrive.

As soon as I open Outlook Classic - they get pulled almost automatically to the AppData folder assuming you have the cloud roaming feature enabled (default setting).

TLDR: Where are Outlook New signature files stored? As soon as I can figure that out I can manage uploading my own templates to users organization wide with Graph.

Answer 1

Hi @Sean Swanson

Welcome to our forum!

Email signatures in the New Outlook and Outlook on the Web (OWA) are stored in the cloud and synchronized across devices, but they are not accessible through the Graph API directly at this time. This means you cannot create, modify, or retrieve email signatures using the Graph API.

Please kindly understand that many functions are not designed at present. To get this feature more quickly, I have found a post in feedback collection website, and you could vote for it. Many features of our current products are designed and upgraded based on customers’ feedback. You can also make suggestions on that website and hope Microsoft will notice this in the future. 

Thanks for your support and understanding! 

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