Old OAB LZX Files

Hi All,

I have a large number of old LZX files (dating back to about 3 years) in my OAB virtual directory.  Any idea why these are hanging around?  I would think when the OAB is updated nightly that they would be flushed into the initial OAB file.  Perhaps this is a poor assumption?  Any insight as to why these are hanging around would be great.  The environment has been in place for longer than 3 years so at some point these files were getting cleaned up.

Thanks in advance for the help!