Logfiles are split daily by default in version 10.
See the LOGDIR parameter.
It can be configured like the default of version 9 with LOGDIR='log'.
The format of HTTP logfile is extended by default in version 10.
It can be configured like the default of version 9 with PROTOLOG=':%C %D'.
Counters are reset weekly by default in version 10.
See the COUNTERDIR parameter.
It can be configured like version 9 with COUNTERDIR='${ADMDIR}/counts'.
The format of "nonce" value is changed in version 10
so that the digest authentication is not shared between version 9 and 10.
Identification protocol is disabled by default in version 10.
It can be enabled like in version 9 with -EId option.