Several Samsung devices do not support email priority (importance).  An email sent with a high or low priority, synchronizes to the Galaxy Tab with no indication of a priority other than normal.  B3007/1174/1642/1162/9486/7485

This is an issue with the device and has been observed on:

-Samsung Galaxy S5, Galaxy S5 Mini, Galaxy Tab, Galaxy Nexus, and Nexus S
-Motorola XOOM and Milestone 3
-HTC EVO and First

In addition, there is no way to set the priority of an email sent from the device. This has been observed on:

-Samsung Charge, Galaxy Captivate, Galaxy S, Galaxy Tab, Galaxy Victory, Galaxy Wonder, and Nexus 10
-Pantech Breakout
-LG Enlighten, Nexus 4, Nexus 5, and Viper 4G LTE
-Kyocera Rise and Torque
-HTC Desire X, First, Nexus 9, One M8
-Huawei 858 Smart and Ascend P1
-Fujitsu F-12C Globetrotter
-Google Nexus 6
-Amazon Kindle Fire HD
-Motorola Moto X
-Verizon Ellipsis 7
-Sharp Aquos Crystal