I love that emails are sent just as they come in to my mailbox rather than sitting there waiting until some time later when you look at them again (unless of course you didn't set up an automatic reply).
If one person sends me multiple unread messages then those will show together all under 1 "unified" tab instead if showing each individual sender individually which is nice since otherwise we have no way knowing who has been reading what! No dislike about this so far but there may be something not mentioned here? Maybe check out other companies/softwares before deciding because others might offer different features or ones better suited towards needs etc.. We solved our problem by having unified threads into Google mail where everything can easily seen from any place including mobile devices via gmail web interface -.