First step: get moblog installed on your windows mobile device. moblog available here.

Step two: Log into your wordpress blog through the interweb and go to the admin panel dashboard thing. Then, in the writing post settings there should be an option about posting using xml-rpc, make sure that this is turned on or you’ll get the “there was an error” error message when trying to connect.

Part three: Back in moblog, create a new profile and enter the details for your blog (the login address field only needs to be the root folder, no need to link directly to any php files).

Lastly: Write some posts, writing of the body is done in html so that you can customise the layout, and check it in the preview.
Once you’re happy you can publish it. It will then appear in wordpress, it also delays putting it live for a few hours to give you chance to check it.

Job done

Hope that someone’s found this useful.