While the Think Outside Bluetooth Stowaway Universal Bluetooth Keyboard driver was already released back in February (see my review here), it wasn't code-signed to be used with the Orange SPV C500 Windows Mobile Smartphone (Orange still requires code signed software, unlike other device makers like i-mate or O2 with their version of the Motorola MPX220).
However, when I checked the Think Outside compatibility page today, I found that they have recently released a code signed Orange SPV C500 driver for their Bluetooth keyboard! :-)
Unlike the previous version, this driver doesn't comes as an Exe to be installed via ActiveSync but is a cab file only which needs to be copied to the Smartphone to be executed there.
In case you face some compatibility problems with your non-Orange Windows Mobile Smartphone (like the i-mate SP3 or SP3i), Think Outside still provides the "old" driver from their archive page.
Cheers ~ Arne