I have an Exchange 2013 installation started with SP1 that I have kept updated installing the Cumulative Updates when they were released.
I have observed that after each CU installation the C: free space (Exchange is installed on C:) was less then before. So I searched in the Exchange install directory and I have found a lot of sub-directories named with an Exchange build number, expecially under the ClientAccess install dir and the OWA subdir.
For instance, under C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\Owa I have many folders named "15.0.995.28", "15.0.995.32", "15.0.1044.21", "15.0.1044.27", "15.0.1076.2", "15.0.1076.10".
The C:\Program Files\Microsoft\Exchange Server\V15\ClientAccess\Owa\prem directory has the same subfolders and is consuming a lot of disk space.
As I could understand, the CU setup should remove the older files but it seems that it does not and keeps older version in these directories. I have tried installing a fresh Exchange 2013 CU8 on a new server and these directories are not present.
The question is: is that correct?
And: can I safely delete the older versions folders?
Thanks