Here are the prerequisites for installing and using the Letsignit add-in.
Available only for Microsoft O365 customers
No limit on number of users
Simultaneous deployment on OWA and Outlook desktop
Using Outlook with a Microsoft 365 subscription
Outlook must be installed with the license included in your O365 subscription
Some Microsoft subscriptions do not include Outlook desktop (the Basic licence for instance)/
O365 messaging only
Available on Windows and MAC
Which O365 license is compatible with the add-in?
https://www.microsoft.com/fr-fr/microsoft-365/business/compare-all-microsoft-365-business-products
Microsoft 365 Apps for Business
Microsoft 365 Business Standard
Microsoft 365 Business Premium
The Microsoft 365 Business Basic license will only allow you to deploy the add-in on the web mail.
How do I know my Outlook license?
On Outlook (Windows)
Go to File > Office Account
The name of your license will be displayed under "Product Information" on the right side of the window.
On your O365 admin console
In the Billing > Your Products section
In the Users > Active Users section
[WINDOWS]
Minimum Windows version required
Event-based add-ins in Outlook on Windows require a minimum of Windows 10 version 1903 or Windows Server 2019 version 1903 to run.
https://docs.microsoft.com/en-us/office/dev/add-ins/outlook/autolaunch
Minimum Outlook version required by update channel :
For users on the current channel: v16.0.14026.20000
For users on the monthly channel: v16.0.14131.20000
For users on the semi annual channel: v16.0.14326.10000
How to know your M365 update channel?
In Outlook desktop, click on File / Office Account / About
How to know the version of your Outlook Windows?
In Outlook desktop, click on File / Account Office / About
[MAC]
Compatible only with the new version of Outlook
How to activate the new version of Outlook for MAC?
1/ Activate the new Outlook version via the toogle on the top right
2/ Click on "Open the new Outlook", Outlook will automatically restart with the new version
Minimum Outlook version required: 16.54 (21101001)
How to know the version of your Outlook MAC?
Click on Outlook menu at the top left, click on "About Outlook".
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