Outlook 2003 can't open this item

Clarifications

Without knowing IF these emails that can't be opened have anything in common.... like where they came from or what is contained in them (attachments?), my first guess would be to look at your anti-virus/anti-spam settings to see if they're blocking the content.

To work around this problem, do not use both the move rule and the size-limit option at the same time. Instead, use either of the following methods:
Turn off the rule to move messages. To change a rule, follow these steps:

1. Click Inbox.

2. On the Tools menu, click Rules Wizard.

3. In the Apply changes to this folder list, click the Inbox that you want.

4. In the Apply rules in the following order box, click the rule that you want to modify.
Disable the Download only item description option. To do this, follow these steps:

1. On the Tools menu, point to Send/Receive Settings, and then click Define Send/Receive Groups.

2. Select a group that contains your e-mail account, and then click Edit.

3. Under Accounts, click your e-mail account.

4. Click to clear the "Download only item description for items larger than" check box.

Please post back if you have any more problems or questions.
If this information is useful, please mark as helpful. Thanks.