Basic functionality, works okay in a Microsoft environment. Lacks essential features. I do not recommend using it for professional emails, or perhaps only internal mail. One major missing feature is 'confirm send' or 'delay send' (20 seconds with undo). Countless times I've hit the big Send button accidentally in the middle of an incomplete email. Requiring a follow up email, looking very unprofessional. I've now switched to a third party email app, which is really unfortunate.