In case anyone is hunting around the forum becasue they can't log on to their BlackBerry Internet Mail mailbox with 'an unexpected error has occured processing the request' this is due to a RIM outage with the system. This affects O2 logins at
www.o2email.co.uk and Vodafone at
www.mobileemail.vodafone.net and no doubt others too (we only deal with Voda and O2 so can only confirm those). I have no idea if this is local to the UK or affects other areas.