Expanded compatibility: Proper support for server object handles greater than 127 (1-byte unsigned), which could previously be misinterpreted and cause certain Outlook operations to fail.
FAST_TRANSFER robustness: Reading PtypString strings now follows the declared length rather than an end marker, eliminating deserialization errors in certain emails.
Removal of an unnecessary search for a mailbox record for synthetic embedded emails, which was causing errors with "email" type attachments.
Deterministic release of email body stream segments at the end of the HTTP pipe: reduces memory pressure during large-scale transfers (export, IMAP, EWS).
Opening segments via O_TMPFILE and eliminating per-segment path calculation: reduced I/O and memory pool latency.
BM-23714: More robust restoration: restoration no longer stops if a reminder cannot be rescheduled — restoration completes, and the affected reminder is ignored.
Folder restoration: Fixed an issue where restoration would fail if a folder had been moved after its parent folder was deleted and a root folder had the same name as that parent folder.
Subscription restoration: only users can subscribe—other entity types are now silently ignored during the restore process (removal of verbose errors with no functional impact).
Hot upgrades: Exclusion of types derived from hot upgrades during operations on an active clone (applies only to installations performing in-place upgrades on the primary instance with an active clone).
OSGi Stability: Added missing checks (TCCL) around the creation of AdminClient during index cleanup and around the writing of the audit log, which could fail in certain classloader contexts.
Lighter indexing: replacing partitioned KStream/KTable with simple RocksDB indexes when sufficient, and removing unnecessary reducers. Faster startup and index rebuilding, reduced memory footprint.