sending emails in outlook 2007 with attachments
 

I recently installed office 2007. Oultlook 2007 started sending and
receiving emails fine. Then today for no apparent reason, emails sent
with attachements, regardless of type (i.e. pdf, doc. xls etc) or size
(less than 1mb) stay in the outbox and cause outlook to freeze up
(I've waited up to 30 minutes). I can forward emails I have received
with attachments and they will send successfully, however any emails I
create and try to attach something to, has the
problem. ????????????????? any ideas????????