Mac OS X 10.6 (“Snow Leopard”) hit last Friday and, unfortunately, the upgrade breaks communication and compatibility with Palm’s aged Palm Desktop software once and for all. Per Macworld UK, third-party developer Mark/Space has stepped forward to offer its Missing Sync for Palm OS, which now supports Snow Leopard, according to a statement released by the company.

The Missing Sync for Palm OS 6.0.4, a 40.1 megabyte download (via MacUpdate), syncs contact information, calendars and tasks with Address Book and iCal, and can also transfer photos, syncs contact photos, syncs music playlists and video, synchronizes notes with Microsoft Entourage, Bare Bones Yojimbo or Mark/Space Notebook, copy folders, documents and files to the Palm OS device, lets you save text messages and extract information, and copies your Treo and Centro call history to your Mac.

Missing Sync for Palm OS retails for US$40, is also available as a US$30 “crossgrade” for users of other Mark/Space products. The software requires Mac OS X 10.4 or later to install and run.