Weird O2 XDA behaviour?

A Friday puzzler for you… Can any of the big brains that read Mobile Industry Review offer any help to a friend who seeing some weird behavior on his Windows Mobile device?

A whole load of emails just ‘leaked’ from my phone to an SMS recipient,  impossible surely?! They were deleted emails (the full content)…  my deleted emails are set to auto-empty normally. The handset is an O2 XDA Orbit 1.

[For those not familiar with the XDA, it’s a re-badged HTC Artemis (HTC P3300) also marketed by T-Mobile as the MDA Compact III.]

Apart from ‘never ever touch Windows Mobile with a barge poll’, can anyone offer any help?  Is this (could it be) a known bug?

I’m going to politely ignore the ‘human error’ option for the moment as this chap knows his tech…