Email tag support on the server would be sweet. We have a client who is a fire department in a "small" town, they are transitioning from Windows 7 to 10, they use eM Client with EWS and rely heavily on tagging emails. New machine was deployed with Windows 10, they installed eM Client, added their account, downloaded all their email and.... WHERE THE HECK ARE MY TAGS!?!?!

This resulted in a very angry call from the Chief asking what the heck? We were able to help them transition/move the eM Client database over to keep the tags, but it would be great if SmarterMail supported these on the server side of things. I believe IMAP has an extension for this that TBird supports as well as eM Client with GMail, I am not 100% sure about EWS though.