Mark/Space today announced a Universal Application update to its award-winning Missing Sync for Palm OS software that will run natively on the entire Macintosh product line. Version 5.1 will ship as a Universal Binary, providing full support for both PowerPC and Intel-based Macs running Mac OS X. Mark/Space expects to make this update available before the end of March. The Missing Sync for Palm OS 5.1 will be a free update to all owners of version 5.0, while upgrades from version 4.0 or older will be priced at US$24.95. New users can purchase version 5.1 for $39.95.