Palm OS 3.0 was Released Year 1995

  3.0.2 Upgrade
Improves power management when the infrared (IR) function is not in use

  3.1 Upgrade
System Patch

  3.1.1 Upgrade
System patch 3.1.1, which corrects minor issues with screen refresh rates and clicking noises that occur when the cover presses buttons on your handheld.

  3.2 Upgrade
Wireless Support for the Palm VII

3.3 Upgrade
Faster HotSync. The maximum HotSync speed is doubled from 57.6 Kbps to 115.2 Kbps
Infrared functionality. You can synchronize wirelessly with an infrared connection and beam data to any device that supports IrDA standards
Euro currency symbol. The Euro currency symbol is added to Palm's virtual numeric keyboardSecure remote access/log-on scripting. IS managers are offered a broader range of security systems to use to protect network access with Palm devices.  

3.5
Support for Color
New Calculator
Agenda View - Manage both appointments and tasks in the same view
Tappable Menus - Activate menus with a simple tap on the menu text at the top of the screen.
Command Bar - Access commonly used features, such as cut, copy, past, delete and beam with quick shortcuts!
Quick Address Book Duplication - Create multiple address book entries faster by duplicating similar entries for the same company or group.  

3.5.2
Fixes a couple of low-level system issues that in rare circumstances might cause certain third party applications to crash (fixes a memory leak)

  4.0
Enhanced Security - Put an automatic lock on your handheld
View and Clear Multiple Alarms - Go to one place to view all the Alarms you have set
Set Silent Alarms - Now if you're in meetings you can set vibrating or LED/flashing light alarms on your m500 or m505 handheld
65,000 Color Support - View email, spreadsheets, eBooks, video clips and photos in brilliant color on a Palm m505 handheld
Easier Data Entry - You can now use the on-screen keyboard and Graffiti® writing at the same time
Wireless Internet and eMail access - Install the included Mobile Connectivity Software on your Palm m500 or m505 handheld and use your data-enabled mobile phone as a wireless modem to get connected.
MMC/SD support