LOS GATOS, Calif.- April 21, 2005 - Mark/Space, Inc. today announced the immediate availability of The Missing Sync™ for hiptop, software that synchronizes contacts and calendar information between a computer running Mac OS X and the popular T-Mobile® Sidekick®.

The Missing Sync for hiptop integrates with Apple's iSync technology to provide two-way data synchronization between a Mac and a T-Mobile Sidekick or Sidekick II. When a user clicks the "Sync Now" button in iSync, their contacts, calendar events and to-do items are synchronized between Mac OS X's Address Book and iCal applications and the corresponding applications on their Sidekick.

"Synchronizing wireless devices with Mac OS X delivers tremendous benefit to users," said Brian Hall, president and CEO of Mark/Space. "By integrating yet another family of mobile devices with Mac OS X, Mark/Space is showing its commitment to provide Mac users with the best possible handheld and smartphone experience available."

Grammy award-winning singer/songwriter and T-Mobile Sidekick II user Seal is one such individual glad to see a solution for his Mac. "I am delighted that Mark/Space is offering this great new service for my T-Mobile Sidekick II. Now it's even easier to keep the information on my Sidekick and my Mac up to date."

Pricing and Availability
The Missing Sync for hiptop currently supports both T-Mobile Sidekick and T-Mobile Sidekick II. Priced at $29.95, the software is available for immediate download from the Mark/Space Online Store at www.markspace.com or through www.hiptop.com.

About Mark/Space, Inc.
Founded in 1990, Mark/Space, Inc., www.markspace.com, develops and markets mobile and wireless software, including the award-winning Missing Sync products that connect a Mac OS computer to handheld devices from Danger, Dell, Garmin, HP, palmOne, Samsung, Sony and others.

Mark/Space and The Missing Sync are trademarks of Mark/Space, Inc. T-Mobile and Sidekick are registered trademarks of T-Mobile USA, Inc. All other product and brand names may be trademarks or registered trademarks of their respective owners.

Company Contact:
Eric Ullman
Director of Sales and Marketing
eullman@markspace.com
+1 408.399.5300 x104