This release is an emergency release. The main focus of this release is the menory leak in the Zarafa-search service. This issue has been address by this release. Alongside upstream also included two other fixes.
ZCP-12062: Search memory leak introduced in 7.1.8
ZCP-12019: Dagent creates much more fallback deliveries than in 7.1.7
ARCH-333: Za-aclsync and za-aclset utilities are broken and give tracebacks