The Adomo has greater integrartion with exchange and integrates with Active directory. It also overcomes the OWA problem and keeps syncronization when checking voicemail thru OWA. Avaya cannot synchronize with OWA. OWA does not support the MAPI client. The only way you can get your voicemail to show in OWA is to send it as an attatchment. When you do that it doesnt synchronise with you telephone. Adomo can, becouse it actually stores messages on the exchange server, and requires no installation to the customers desktop. We did not sell them this device, but I do see why they like it.