SFTP: Added support for ActionOnExistingFiles.OverwriteDifferentChecksum to Upload/Download methods.
File Server: Added workaround for content streams that do not support seeking beyond the end-of-stream.
File Server: A meaningful error message is now reported when a virtual file system operation is canceled in the preview event.
File Server: Added Action property to FileServer.PathAccessAuthorization event arguments.
File Server: Messages from FileSystemException error now propagate to the SFTP subsystem.
Mail: Added MailMessage.References property.
Terminal: Added TerminalFontInfo.Bold property to make regular fonts bold.
ZIP: Optimized memory usage to accommodate ZIP files with more items.
ZIP: Internal optimizations.
ZIP: Usage of ActionOnExistingFiles.ResumeIfPossible in ZipArchive method arguments triggers ArgumentException (resume is not supported for ZIP files).