Defacto is a bit disappointing It's a well known mail client for a long time - almost the defacto standard for 3rd party Android mail clients perhaps. But it feels like it needs an interface overhaul. Just feels a bit dated and stale. Functionality is good but for me I found connectivity to exchange by owa far slower than other clients I've tried. Also it seems unable to deal properly with nested folders. Some folders I've been unable to see at all.
April 04 2016