PALM OS® SOFTWARE
Palm™ Desktop Software for Macintosh v2.6.1
The Palm Desktop Software for Macintosh v2.6.1 is for use with any Palm™ handheld to synchronize with PowerPC processor-equipped Macintosh computers.
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Palm OS® v3.5.2 Update
This is a system update for Palm OS software versions 3.5.0 and 3.5.1. It fixes a couple of low-level system issues that in rare circumstances might cause certain third party applications to crash.
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PalmDesktopUpdater.exe
This upgrade fixes 3 main problems related to the HotSync Manager and its interaction with some computers. These issues are: 

Some computers with Windows 2000 installed cannot synchronize with Palm handhelds via the infrared port. This problem is related to changes in Windows 2000 IR configuration. HotSync manager has been updated to accommodate these changes. Some computers with Windows 2000 installed may not undock properly if an older version of HotSync manager is running on the computers. On some computers, Windows may lock up if the Hotsync Manager is running and the cradle is connected to the computer. WWW
HotSync® v3.0.4 Update
The Palm HotSync® Manager v3.0.4 Update is designed for use with Palm™ Desktop Software v3.0 or above. This update does not install a full version of the Palm Desktop software; it installs only an update to existing software. Certain features of the update will only be useful if the user has version 3.3 or later of Palm OS software installed on their device. See below for details. This update applies ONLY to users of the English-language version of the Palm Desktop. 
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Palm Desktop® 3.03
This software is for use with all Palm Computing® connected organizer users with PCs running Windows 98/95/NT 4.0. If you are using a Palm VII™ handheld, click here to download the Palm Desktop Software v3.0.1 for use with your handheld. NOTE: This software installs Palm™ Desktop 3.0.1. The version of HotSync® Manager installed is version 3.0.3. Minimum System Requirements IBM-compatible 486 PC or higher Windows 95/98 or NT 4.0 8MB RAM minimum (16MB recommended) 20MB available hard disk space One available serial port Mouse Users upgrading from previous versions of the Palm Desktop software will find new features* to extend the functionality of their Palm Computing organizers.
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OS 3.3 Update
Palm Computing released its first 'official' software-based, Palm Operating System upgrade for users of the Palm OS 3.1.1.  WWW