This issue was resolved few months ago actually. What happens was one of the directors always had trouble sync with the Exchange Server. However, he didn't want to use Blackberry. He had 5 different WM phone at home. He tried all of them and still had the same issue. Everytime, he had to power cycle (turn off the phone and take the battery out) the phone, then it will sync again. After a while, it will not work again.
Eventually, we found out he plugged the phone to laptop to sync the notes through USB. Our internal Exchange Server ip is 10.x.x.x. The webmail address he used to sync wirelessly is a public address of course. Based on the research found in internet, it has to do with Windows Mobile DNS cache not being cleared properly when USB cable is unplugged. When plugged into the desktop to sync inside the office, it will use the internal address for Exchange server. After unplugged from USB, it will cause issue of course because the DNS will point to internal address of Exchange server instead of the webmail address. Workaround....powercycle after unplug from a machine in the internal network.
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