I`m seeing the same issue with Outlook 2016, plus some. The issues we are seeing with the latest SM 14 + Outlook 2016 synced via EAS:
- Marking emails as read - sometimes they go back to being unread after 1 sec or so
- Marking emails as read - most of the times they stay read in Outlook 2016, but the read status is not synced back to SM. In WebMail, ~ 70% of emails marked as read in Outlook 2016 are still unread.. Moreover, since we all have also smartphones connected via EAS, we can also see the emails there being as unread.
- Moving emails in folders using Outlook 2016 is in at least 50% of the cases not synced back to SM (in WebMail they are in the same folder and so they also appear using the smartphone clients)
- Some users get 25% of their emails stuck in the Outbox when sending email via Outlook 2016.
To conclude, it seems that syncing SM to Outlook 2016 via EAS is flaky at best. However, our users need Outlook and only via EAS it comes close to having the same functionality as when they synced to an Exchange server..
I really hope SmarterMail devs are working on improving the functionality of SM and Outlook 2016 via EAS, otherwise moving from MS Exchange to SM was a mistake..