I have a PC that I support that doesn't keep the time. It seems that Outlook is the cause... or it may be a victim. When I come in to work in the morning, the time reads the afternoon for the day before. If you correct the time, all the emails will pop in to the Inbox that were sent between the time it had to the time it was just set to. Also, the time will be wrong during the day, then change itself back to the correct time.
Already replaced the Motherboard. Scanned for viruses from a boot disk. It still happens.
It only happens to her PC. Can it be her mailbox on the Exchange server? I haven't seen this before. But never woked with Exchange servers before a few months ago. Any ideas?