We have added a new article in Microsof Windows XP Professional section. The detail of this article is
Title: Windows XP Clients do not Receive "new mail" Notification Messages after you Install Service Pack 1
Purpose: After you install Service Pack 1 (SP1) for Windows XP Professional, you may no longer receive Outlook "new mail" notifications when you receive e-mail messages. The purpose of this article is to solve this problem.
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