I've just received this interesting news (interesting for all who have an I-mate smartphone with Windows Mobile 5): a new operating system upgrade (version 2.6.331.2) is available and it contains a lot of major features:
Microsoft Messaging and Security Feature Pack (MSFP):
Addition of the MSFP allowing Direct Push email, remote device wiping, security policy enforcement and Global Address List Lookup for customers using a Microsoft Exchange Server 2003 with Service Pack 2.
File beaming over Bluetooth:
It is now possible to beam files over Bluetooth using the file manager.
Improved radio functionality:
Microphone level has been boosted.
Cell Broadcast display is now supported.
Line2 functionality introduced.
Busy Tone corrected.
Improved the echo suppression.
USSD service support is upgraded.
Updated MMS:
MMS will now operate until there is only 1 Mb of free storage space. Previously this limit was set at 4Mb. 
MMS client updated to the current version
Improved Pocket Internet Explorer:
Frames functionality now supported in the browser.
Quick navigation using Page Up key (key 2) and Page Down key (key 8).
Keypad Light Timing:
The timeout of the keypad light can now be set. There is a utility in the 'Utilities' section of the SP5m support pages that will let you set it. Note that setting the keypad light over 8 seconds will cause significant reduction in battery life. Voice Dial:
Voice Dial reliability from handset has been improved. Communication Manager:
Communication Manager has been updated to allow current data services to be stopped, Direct Push email to be started/stopped using a single button press, and flight mode to be switched on/off. Reminders:
When the device is locked, calendar reminders can be snoozed by using the joystick. Previously it was only possible to press the numeric key associated with the menu option to snooze a reminder. Bluetooth:
Car Kit interface: Address book sync can now be performed to car kits.
Bluetooth Beaming from file manager has now been improved (more reliable and faster).
Java:
Updated Java client to latest version.
I'm happy to see that the MMS bug I've signalled in the past (at least 4Mb of free storage) is now correct (it's very noisy) and the addition of the new MSFP feature is a big added value to the smartphone. Now I need the time to upgrade my device (and backup all the data I've on it)... 