[Blind-sysadmins] exchange 2010 and cashing

Hi, I have a few users who all connect to one mailbox running exchange2010 when they use cashing mode they are not always getting e-mails and they can't see what others are adding to the sub folders. If they turn it off they can see everything. The pro to them using cashing mode is that they have better performance on their main e-mail accounts. Is there a way to get everything to show up when cashing mode is on?