Error is displayed on Standard client when opening the users mailfile.

To fix shut down the Notes client and then delete the following folders under the Data folder:

Data\workspace\.metadata\.plugins\com.ibm.portal.app

Data\workspace\.metadata\.plugins\com.ibm.rcp.portal.app

Restart the Notes client.


Thanks to Stephan Bovet for his post on the 8.5 forum for this solution.