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PalmSource sold PDA/PC calendar and contact sharing service WebSync, which it acquired in 2000, to a company called Tanner Research back 2004. Today, that company relaunched what it asserts is a completely reengineered version of the solution as ClearSync 1.0.

With ClearSync, groups of users can share and sync multiple calendars and contact lists between any combination of PCs and Palm OS PDAs or smartphones. Like Outlook, ClearSync allows access to calendars and contacts even when Internet access is not available. And like Google or Yahoo Calendars, ClearSync allows people to share calendars and contact lists with others with whom they do not share a common server.

Calendar and contact information can be created and edited on either PCs or Palm handhelds and these changes propagated to the other platforms. ClearSync also supports a browser-based viewer so calendars and contacts can be viewed on any platform with a Web browser including Macintoshes and Linux PCs.

ClearSync users can share their work calendar with their coworkers, a separate calendar with their families, and yet other calendars with other groups they belong to such as sports teams, schools, clubs, etc.

The mobile application allows multiple calendars to be stored, viewed, and edited on a Palm device. Similar to the ClearSync PC application, the Palm software can display calendars one at a time, side by side, or merged with color coding.

While calendar events can be displayed together to show the user their complete agenda, the calendar data remains on separate calendars, each of which is shared with its own distinct group of users. Contact lists and one calendar can be synchronized with Outlook.

Data can be updated wirelessly for smartphones like the Treo.

"We recognize that most people belong to many separate groups," according to John Tanner, president & CEO of ClearSync. "We've designed ClearSync to allow people to maintain a separate calendar and contact list for each group, and to fully synchronize them between PCs and Palm handheld devices.

"That way, people can capture their crucial data whether they are at their desk, in a meeting, or at their kid's soccer practice, and all this data will be available to them and their sharing groups whenever and wherever they need it," Tanner added.