The Apache service named reported the following error:
>>> httpd.exe: Syntax error on line 116 of C:/Program Files (x86)/CollabNet Subversion Server/httpd/conf/httpd.conf: Cannot load C:/Program Files (x86)/CollabNet Subversion Server/httpd/modules/mod_dav_svn.so into server: The specified module could not be found.
The error message here is somewhat misleading. We got this error even though the file mod_dav_svn.so was both present and accessible at the specified location (the forward slashes do not pose problems). However, as it turns out, some of its dependencies were not.
After adding the subversion servers installation directory, C:/Program Files (x86)/CollabNet Subversion Server/, to the system PATH variable, the Apache service started without a problem.