Hi,
You can install the 7.1 webaccess package manually.
I have a 9.1 server running zarafa version 7.2.4, installation is a bit complicated.
Because of php version things, because some binaries have moved which require templates adjustments,
because the zarafa processes are no longer run by root but by a dedicated user, there are new processes (indexing), because the zarafa config files in smeserver-zarafa-unix are version 7.1.