/usr/lib/x86_64-linux-gnu/libmapiserver.so.0 is in openchangeserver 1:2.0-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmapiserver.so.2.0
/usr/lib/x86_64-linux-gnu/libmapiserver.so.2.0