The best thing about this software is that there is no need to configure Office 365. Unlike ProofPoint, AVANAN does not disable Office 365 email security, instead it adds another layer of security. Plus it does not prevent users from sending emails like Proofpoint tends to do.
The only con about the software is that is a little bit expensive.
Ease of use and the availability to use a variety of best-in-class security vendors.
A little slow on response via any browser.