Email client - server side software?
 

We're using Smartermail from SmarterTools... frankly it's been a nightmare to deal with and still not working. let along they LOVE to continue to charge for support which can't help one bit.

We're on their most up-to-date software along with ActiveSync, but it can't connect to Outlook (we NEED Outlook to run). Works on iPhone and Android, but not on a PC.

They claim we need some "RTM version of Outlook" which M$ says, yeah for $79 per license and a hefty subscription to their MSDN service we can. Basically I was told, WTF is your email provider talking about?

Anyway, need a new email solution that runs server side and supports Exchange & ActiveSync. Any suggestions?