Emails disappear from inbox using Outlook 2000

Hi,

Two possible causes for this behavior are:

    * You have a filter that applies to only display unread messages.
    * You are looking at a Microsoft Exchange Mailbox and have an instance of Outlook running that has delivery set to a Personal Folders (.pst) file.

Follow the below methods to troubleshoot the problem : email disppears from inbox.
Cause 1
To remove all filters, follow these steps:

   1. On the View menu, point to Current View, and then click Customize Current View.
   2. In the View Summary dialog box, click Filter.
   3. In the Filter dialog box, click Clear All, and then click OK twice.

All e-mail messages, both read and unread, are now visible.

Cause 2
NOTE: The procedures in this article only apply if you have installed Outlook with the Corporate or Workgroup option. With this option, you can use Messaging Application Programming Interface (MAPI) services. To determine your installation type, click About Microsoft Outlook on the Help menu. If you have the Corporate or Workgroup installation, you see "Corporate or Workgroup".

If you are viewing your Inbox on an Exchange Server mailbox by using Outlook in the Corporate or Worgroup (CW) configuration, make sure the delivery point is set to your mailbox and not a Personal Folders File anywhere you are running Outlook.

   1. On the Tools menu, click Services.
   2. Click the Delivery tab, make sure that "Deliver new mail to the following location" is set to your mailbox and then click OK.

Source: http://support.microsoft.com/kb/253503

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