My big mistake: Not using this earlier! I have 9 email accounts I am using, all work perfectly in both the iOS and Mac versions. Amazing and genuinely useful features... Convert an email to PDF, ability to duplicate an email in one gmail account into another, and other features I have not even seen in other email programs. Best email program I have ever used, by a big margin. All edits to gmail labels / folders does a 2-way sync, no problems at all. A few questions to support brought me to Sarah, she was fast and her responses clear (i.e. How to download on more than one Mac, etc).