Re: Any plans to add contact sync to AquaMail/EWS
I'd like to, but there are other things I'm going to complete first, a few (2-3) large-ish features that are highly visible for all types of accounts.
Re: can you recommend Exchange Contact Sync
Sorry, I don't actually use Exchange myself, it's only a test account, and as such, not very knowledgeable about these things.
One idea is to set up the account in Gmail app and turn off Mail sync in it (system settings -> accounts -> click into Gmail Corporate Account -> you'll see things that are synced under it).
Haven't tried it, just a thought...
Oh, and there are contact sync apps in Google Play, I understand that the focus there is on WebDAV, but maybe there are some that support EWS (or even ActiveSync), but that's just hopeful guesses too, sorry.