Email signature VSTO vs Web Add-ins

Updated August 23, 2024 12:49

This article shows the differences between Email Signatures for the VSTO add-ins and the web add-ins.

At least one of the following Email Signature modules enabled; Email Signature VSTO Add-in or Email Signature Web Add-in

Functional	Subject	VSTO add-in	Web add-in
	Font Distribution	Supported	Not supported
	Access signatures offline	Supported	Not supported
	Applying signature from the end user side	Signature is saved in local machine	Relays into an API to fetch the matching signature of the end-user*
	New Outlook (PC)	Not Supported	Supported
	Switch between signatures	Use the native signature functionality	Relying on the Templafy email signature task pane
Technical	Coverage	PC only	PC/Outlook Online (OWA & PWA) /Outlook on Mac /Mobile Devices
	Pre-requisites	Hive pre-requisites	Office 365 subscription
	Deployment	Deployment of Templafy Email Signature for Outlook	How to Distribute Templafy Web Add-ins

Internal/External email signatures on Mac requires Outlook New UI for Mac, version 16.38.506 or above (as well as Templafy manifest version 1.0.0.12 or above)
Due to a limitation from Microsoft, when using the web add-in there is a line of Calibri 12 added above the signature.
When using web add-in automatic insertion of signatures is unstable and sometimes not working on draft emails. Resuming a draft without a signature will not trigger the automatic insertion of the signature. Changing the recipients will insert the signature sometimes, but this behavior cannot be trusted, and the wrong signature (internal instead of external) could be inserted - limitation due to Microsoft's current capabilities. Requires manual insertion via the taskpane.
On Mac when forwarding an email with multiple images sometimes Outlook will fail to load some of the pictures. This is confirmed as an issue by Microsoft.
* - Based off this workflow, Web add-in will take precedence over Outlook signatures.

add-ins web add-ins Email signature VSTO add-in Outlook

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