email attachments filename too long. Attachments arrive with filename renamed as ATT* and files are now .dat and .htm files

iphone 4 forwarded .docx or .pdf files.  In Outlook, they appear as .dat and .htm files AND the files are renamed as ATT*    If I reduce the filenames to less than 65 characters, then they are all ok.  Is there a config on the exchange server to increase this limit?  Am using exchange 2003.  I've also tested this on an exchange 2010 server, and it doesn't have this issue.