Need some help with HTC Touch Pro 2 and web based mail

[bones20]

I know the exact problem but not the solution. This is when the problem occurs:
At night 12:00 AM when outlook tries to clear the previous days messages before disconnecting, it somehow fails and gets stuck while doing it; blocking the email scheduler. My emails are stored on the main memory. Not sure what the problem is. I am using Gmail IMAP.