do you have a little arrow next to each attachment??
are these attachments that are in the email folder that you have Active Sync'd across????
it sounds to me that you haven't set active sync to copy attachments............go to options, inbox, settings......down the bottom you get the chance to copy message attachments across upto a pre-determined size
if it's via pop3 dial / gprs tha tyou can't do it, then it's probably because you have created an account to download message body or headers only....just tap and hold on the appropriate email message and select 'mark for download'
of course, i may be in danger of teaching the proverbial egg sucking !!!
perhaps a hard reset is required....i have had no issues with jpg etc
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