Reading emails in Dynamics 365 CRM using classic Social pane (v8) or timeline control (Dynamics 365 v9) is not very user-friendly.
For example timeline control displays all activities in a chronological order with partial details of each email activity. This is helpful and works fine as long as there are few activities … however when the count starts increasing (which is normally the case)…reading through the activities especially emails is quite difficult. Further to view the email details, you would need to open each email activity record (which opens in a separate form)…thus increasing the number of clicks needed!
Zap Email Reader App on the other hand provides an Outlook like reading interface right within Dynamics 365 CRM. The reading pane allows easy reading of the email contents without the need to open up each email record!