Good morning from Arizona-U.S.
First - I want to state that the Android email app I have defaulted to since discovering it is AquaMail. By far the only Android app I prefer to use for my email.
Second - For the past 1 year I have been using the Windows Phone 8.0/8.1 platform, and have been using it specifically for the reasons for this posted topic that I am replying to. I was an avid user of Android from 2010-2014 in which I was forced to switch due to my companies corporate policies and lack of support for Android/activesync devices. Currently supported at my workplace only are iOS and Windows Phone devices. However, recently I began researching more within the use of AquaMail and being able to sync my corporate mail using EWS. I had not attempted to do this before because Android was not a supported platform, and so assumed not to try it anymore. Normally using all other Andorid mail apps with acivesync would fail, along with quarantining my phone on my mail account. Long story short--I began attempting to use AquaMail EWS feature to access my corporate email last week since switching to a Windows Phone. To my surprise (for lack of a better word) it worked (well...for a short while). After I had jumped to using a Windows Phone (activesync), I had tossed all my Android devices so was only able to use the older version of AM on an older Moto Droid X2 device. I am going to have to post more in another separate thread about my issues staying connected to my corporate email using EWS. In any case the AquaMail app is THE ONLY Android Platform app I have ever been able to use to connect to my corporate email account with. I am sure there are other EWS email apps out there that might connect to my corporate email too, but honestly I will stay devoted to AM if I can get it to work with my corporate email.
Third - I agree with most posts in this forum and second the advancement of the AM app as it exists now. The activesync protocol though feature rich gives its creator/author more control, and in the end as we all know more change in their pockets. If there is a way to get what is needed out of what is already in place with some tweaks and fine tuning then that is the best option IMO--though never the easiest. I am not a developer, but write and modify UNIX/Linux scripts weekly for myself to better do my job, so my hat's off to you Kostya. To lay the foundation of this app down so that it can be as solid as it is, allowing it to be updated/supported as you most definitely have, and to even expand on it to make it better with the demands and needs going into the future is very rare coming from a standalone Android developer. I see so many apps out there orphaned nowadays. Thank you.