This is from the help function in Outlook:
Delete a message stuck in the Outbox
Applies to: Microsoft Office Outlook 2003
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Applies to
Microsoft Office Outlook® 2003
Microsoft Outlook® 2002
If you send an e-mail message with an attachment but the message remains in
your Outbox, you can try to delete it. If you can't delete the message, the
following are some options you can try.
Option 1: Temporarily uninstall or disable firewall and antivirus software
One reason for a message to get stuck in the Outbox is that you have some
type of firewall or antivirus software installed. If you have any firewall or
antivirus software installed, exit Outlook, and then temporarily uninstall or
disable the firewall and antivirus software.
Restart Outlook and try to delete the e-mail message in your Outbox. If you
still can't delete the message, reinstall or enable your firewall and
antivirus software and try to Option 2.
Option 2: Start Outlook in safe mode
Exit Outlook if you have it open.
On the taskbar, click Start, and then click Run.
In the Open box, type Outlook /safe.
Note There is a space between Outlook and the forward slash (/).
Click OK.
Try to delete the e-mail message in your Outbox.
If you still can't delete the message, exit Outlook started in safe mode,
restart Outlook, and try Option 3.
Option 3: Create a new Outlook profile
Your profile might be damaged. Creating a new profile requires you to set up
your e-mail accounts again, but if you save your messages to your computer,
you can still use your old e-mail messages. The Personal Folders file (.pst)
(Personal Folders file (.pst): Data file that stores your messages and other
items on your computer. You can assign a .pst file to be the default delivery
location for e-mail messages. You can use a .pst to organize and back up
items for safekeeping.) that you used in the original profile can be used
with the new profile.
Make sure you know the name of the .pst file that contains all of your
Outlook items.
How?
In the Navigation Pane (Navigation Pane: The column on the left side of the
Outlook window that includes panes such as Shortcuts or Mail and the
shortcuts or folders within each pane. Click a folder to show the items in
the folder.), right-click Personal Folders, and then click Properties.
Click Advanced.
The location and name of the .pst file appears in the Filename box.
Open the Mail Setup dialog box.
How?
In Microsoft Windows XP or Microsoft Windows Server 2003
In Control Panel, click User Accounts, and then click Mail.
Note If you are using Control Panel classic view, double-click Mail.
In Microsoft Windows 2000
In Control Panel, double-click Mail.
Click Show Profiles.
Click Add.
Type a name for the profile (Outlook e-mail profile: A profile is what
Outlook uses to remember the e-mail accounts and the settings that tell
Outlook where your e-mail is stored.), and then click OK.
Add your e-mail account.
Add an e-mail account
Click Add a new e-mail account, and then click Next.
Select the e-mail server used for your account, and then click Next.
Note If you are setting up an MSN e-mail account, click POP3 for MSN
Internet Access version 5.3 or earlier. For MSN Explorer, click HTTP.
In the appropriate boxes, type the information given by your Internet
service provider (ISP) (ISP: A business that provides access to the Internet
for such things as electronic mail, chat rooms, or use of the World Wide Web.
Some ISPs are multinational, offering access in many locations, while others
are limited to a specific region.) or administrator.
Notes
If you are using an MSN or MSN Hotmail account, we recommend that you use
the Microsoft Office Outlook Connector, which provides more reliable access
to your e-mail messages, calendar, contacts, tasks, and notes attached to
your account.
Unless your ISP has indicated that your service uses Secure Password
Authentication (SPA), do not select the Log on using Secure Password
Authentication (SPA) check box.
Unless specified by your ISP, all server and address entries are typed in
lowercase letters. Some ISPs require a combination of lowercase and uppercase
letters for passwords to add further security — for example, passWorD. Check
with your ISP to see if it requires a case-sensitive password. Use strong
passwords that combine upper- and lowercase letters, numbers, and symbols.
Weak passwords don't mix these elements. Strong password: Y6dh!et5. Weak
password: House27. Use a strong password that you can remember so that you
don't have to write it down.
You have the option of having Outlook remember your password by typing it in
the Password box and selecting the Remember password check box. While this
means that you won't have to type your password each time you access the
account, it also means that the account is vulnerable to anyone who has
access to your computer.
Do any of the following:
If you are adding a Microsoft Exchange Server account, click Check Names to
verify that the server recognizes your name. The name and server that you
entered should become underlined. Be sure your computer is connected to your
network. If your name does not become underlined, contact your administrator.
If you are adding a POP3 (POP3: A common protocol that is used to retrieve
e-mail messages from an Internet e-mail server.) server account, click Test
Account Settings to verify that your account is working. If there is missing
or incorrect information, such as your password, you are prompted to type or
correct it. Be sure your computer is connected to the Internet.
If you want to configure additional settings, such as how you want your
computer to connect to your e-mail server, click More Settings. Otherwise,
click Next.
Click Finish.
In the Mail dialog box, click Prompt for a profile to be used, and then
click OK.
Restart Outlook, and then select the new profile.
You can import your saved messages from your old .pst file that was used by
the previous profile by doing the following:
On the File menu, click Import and Export.
Click Import from another program or file, and then click Next.
Click Personal Folder File (.pst), and then click Next.
In the File to import box, specify the path and file name of the .pst file
that you want to import.
Choose one of the following:
Replace duplicates with items imported Existing data is overwritten with
the information in the .pst file being imported.
Allow duplicates to be created Existing data is not overwritten, and
duplicates are added to the current Outlook folder.
Do not import duplicate items Existing data is kept, and the duplicate
information in the .pst file is not copied to the current Outlook folder.
Follow the remaining instructions in the Import and Export Wizard.
Note You should not import items (item: An item is the basic element that
holds information in Outlook (similar to a file in other programs). Items
include e-mail messages, appointments, contacts, tasks, journal entries,
notes, posted items, and documents.) created in multiple languages or in a
language that is not supported by your system code page to a file type that
does not support Unicode. For example, if you have items created in multiple
languages in a .pst file, you should not import the items to a Microsoft
Outlook 97-2002 .pst file. This file type does not support Unicode;
therefore, for any items containing characters in any language other than
those supported by the system code page, where these characters appear in
text fields other than the body of items (such as the To and Subject lines of
messages), the ContactName and BusinessTelephoneNumber properties of contact
items are interpreted incorrectly and result in the display of question marks
("?"s) and other unintelligible text.
Also see in Help:
E-mail message with an attachment is sent repeatedly to recipients
