Problem :
When you open mailbox client on Lotus Notes Standard Edition 8.5.1 with FP5 installed, randomly will raise an error “CWPCA8522E Application did not get installed”
Cause :
According to https://www-304.ibm.com/support/docview.wss?uid=swg21444533, commonly there are multiple XML files defined in the Composite Application portion of the application referenced in the error message. In my experience when you installed Lotus Notes Standard 8.5.1 Fix Patch 5 randomly caused this error.
Solution:
To fix, delete the following folders under the Data folder:
..\Notes\Data\workspace\.metadata\.plugins\com.ibm.portal.app
..\Notes\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.
http://www-10.lotus.com/ldd/nd85forum.nsf/dba3ca7e515d55ff85256a0700727b35/b452bc37c471501e852576b9007df222?OpenDocument