After you register, 4th Office automatically syncs your last 30 days of emails. If, however, you'd like to see your entire email history, you can do so on the desktop app.
- Go to Settings in the menu
- Head to Account
- Choose to sync all your email history
- Done! Just relax and wait a few minutes while the app syncs your emails
You can't currently see your whole email history on the iOS app. But we're working on it, so watch this space...