Solved - "An administrative policy prevents you from viewing this item in the Reading Pane"
This is informational to those that have upgraded to EV 10.0.2 from EV 9 and are using Virtual Vault.
If you are creating a new Desktop Policy you no longer have the option Show content in Reading Pane - Always show content. This is found under Advanced, Virtual Vault, Setting for Show content in Reading Pane, Value is Always show content.
This was problematic for our end users. They did not like the restriction "An administrative policy prevents you from viewing this item in the Reading Pane."
My workaround was to copy a Desktop Policy that was created when we were using EV 9.
Right click on a policy and choose Copy Policy. Give it a new name and update all the other Settings but leave Show content in Reading Pane set to Always show content. Run Provisioning and Synchronize mailboxes.
The users are once again able to view items in their reading pane.