Originally Posted by takeshi
I've been able to reoslve this in the past by using Desktop Manager to selectively backup Messages, clear the Messages database on the handheld, restore the Messages and then delete the un-deleteable message. Whether or not this is worth the effort is really your judgement call. I'd probably choose to just hide filed messages unless there were a number of un-deleteable messages.
Don't know if you follow your subscriptions, but just want to thank you for this post. I used it on an 8703e and it worked like a charm.