eM Client sync (airsync) everything except the mails folder ?

I recently started with eM Client,
I’m trying to sync my data from office (exchange server 2007 with only ActiveSync capacities activated). My laptop is on Win10,
I used a Outlook account but changed the server to my company server adress
I gave my credentials and eM Client has managed to sync everything correctly (calendars, tasks, notes) but refuse to display any mail folder.
If I check the logs when I refresh I can see a line for every folder : calendar / notes / tasks but none for the mails ?
Any ideas ?
Many thanks