Hey all you Treo admins out there. Yeah I know they suck, but I have to support them too.
We use two different carriers for our Treos (Cingular and VZW) and last November when Cingular dropped Xpressmail for the Treos, we got hooked on Good Messaging.
We liked it so much (as admins), we even used it to replace Intellisync's Wireless Sync that we were servicing our VZW Treos with.
It has a much slicker interface and it uses push technology instead of crappy check every 3 minutes from the device and manual syncs.