Supported versions:

For Windows:
  Windows Outlook for Microsoft 365 (Version 2108 - Build 14326.21018) and higher (Microsoft 365 subscription required)
 Outlook 2019 (Version 2111) and higher – partially supported*
 Outlook 2021 – partially supported*
 Windows 10 (Version 1903 - Build 18362) or Windows Server 2019 (Version 1903) and higher – older versions are partially supported*
*partially supported means that with the Sigsync Add-in you can:
  preview signatures from add-in pane while composing an email
  add signatures manually from the add-in pane using 'Add This Signature' button

For Mac (early access version of the Sigsync Add-in):
 Outlook for Mac (Version 16.59 - Build 22031300) and higher (Microsoft 365 subscription required)
Please note that the 'New Outlook' toggle located in the upper-right corner of Outlook for Mac must be switched to 'On'. In case the toggle is not visible, you can click on 'Outlook' in the menu bar and select 'New Outlook' to activate it.

Outlook on the web (OWA): 
Requirements: Sigsync Signatures Add-in for Outlook is compatible with all modern web browsers such as
  Microsoft Edge
  Google Chrome
  Mozilla Firefox
  Safari

Note
Although the Sigsync Signatures Add-in for Outlook can be used with shared mailboxes, full support may not be available on Outlook Mac. This is because shared mailboxes are not yet officially supported on Microsoft's Office Add-in platform.
Sigsync requires Microsoft 365 global admin rights (required for centralized deployment of the Sigsync Signatures Add-in only).

1. If you are using the Outlook desktop version, you can click on File->Manage Add-ins and it will open a web page in the browser.

   

2. You have to login first to access Microsoft Add-ins settings. Click the My add-ins and then click the '+ Add a custom add-in' option. Select Add from URL in the drop-down menu and paste the below link to manifest file as shown to deploy the Client side Sigsync Signatures add-in for Outlook.

   https://www.sigsync.com/clientaddin/SigsyncDeployCopy link

   

3. Click on the OK button.

   

4. Click on the Install button. Sigsync Signatures add-in for Outlook will now be successfully deployed.

   

5. Sigsync Signatures add-in for Outlook is now ready to use. You can open the Sigsync Signatures add-in by clicking on the 'Preview and Add Signature'  button under 'Sigsync Signatures' at the top right corner of the Outlook desktop application.

   

6. If you have made any changes to rules in Signature Rules or to templates in Signature Generator, then you have to close the Sigsync Signatures add-in and reopen to view the applied changes.