I've set up an IMAP account for my E-mail system at work. It's a GroupWise system. The account does refresh with new mail right after I power off my phone and then power on again, but after a short time it stops doing that and only shows me new mail when I "go into" the account and hit refresh. I've experimented with different refresh times, from 5 minutes on up, but nothing seems to help. Any ideas on how to fix this?