The guiding rule.
Exchange server 2013+ and Outlook version 2013+ support Microsoft Office Add-ins.
Outlook versions supported:
Outlook on the Web
Outlook 2016 for Mac
Hence, if your company has Exchange 2010 and Outlook 2016. Your company will not be able to use Office add-ins from Outlook. Because minimum requirements are Exchange server 2013.
Microsoft resources available:
Outlook add-in deployment
For on-premises and online environments, you can deploy Outlook add-ins via the Office 365 Admin Center or Exchange Admin Center.
Outlook add-in deployment requires:
Office 365, Exchange Online, or Exchange Server 2013 or later
Outlook 2013 or later