iPhone and Exchange IMAP/POP3 timeout   

I am having an issue with one my customers iPhone and connecting to his 
exchange 2003 server. I can connect via wifi and download emails but going 
through the AT&T Edge network the connection seems to timeout with both IMAP 
and POP3. Is there a way to adjust/lengthen the timeout period on the server 
for IMAP and POP3?

date: Mon, 28 Apr 2008 11:31:01 -0700   author:   Jason4101