Is my email account compatible with Boomerang for Outlook?

Boomerang for Outlook supports Microsoft's free email offers (Outlook.com, Live.com, Msn.com, hotmail.com), Exchange Online (Microsoft hosted), and Exchange 2015 servers in Hybrid Deployments.  

If you're not sure if your account is supported, an easy test is to look at how you access Outlook on the Web.  If you log into your email account at Outlook.com, Office.com, Live.com, or another Microsoft domain, you are likely supported.  If you log in to your company's domain, you are likely not supported (unless you are on a hybrid deployment - but this is rare).