Threema 1.8.0 for Windows Phone is available for download. This update introduces quite a few new features:
Unsent messages are saved as drafts
Messages can be deleted in bulk by using the new selection tool
Contacts can be blocked individually (by enabling “Block contact” in a contact’s detail view)
Streamlined backup and restore process; the Threema ID is now included in data backups
The status of a chat’s latest message is now indicated in the chat overview
A new setting (in Settings > Privacy) allows to specify whether contacts are sorted by first or by last name
Furthermore, the 1.8.0 update also includes some bug fixes and miscellaneous other improvements.