I assume you don't have it set up to store a copy in your Sent Items?
The settings may depend on your account settings (Exchange/imap/pop3 what not)
From the Office.Microsoft pages:
Change where sent messages are saved when using an IMAP e-mail account
In Microsoft Office Outlook 2007, you
can specify where sent items are saved
for your IMAP e-mail account. For
example, if you are at work and add a
personal e-mail account to Outlook,
you can configure your sent items to
be saved in the Sent Items folder of
the data file or in a Personal Folders
file (.pst) for your personal account.
NOTE The first time you send an e-mail message with your IMAP account,
you are prompted to choose the folder
where you want sent items saved.
- On the Tools menu, click Account Settings.
- Select an e-mail account that is not an Exchange account, and then click
- Click More Settings.
In the Internet E-mail Settings dialog box, click the Folders tab.
To choose a custom folder for saving your sent items, click Choose
an existing folder or create a new
folder to save your sent items for
this account in.
- Click a folder to save the sent items in, or click New Folder.
By default, the sent messages from all your accounts are saved in the
default Sent Items folder in Outlook.
If you have an Exchange account in
your Outlook profile, the default
folder is Sent Items in your Exchange
Click Choose an existing folder or create a new folder to save your sent
items for this account in, expand the
folder list, and then click a folder.
Usually, you choose Sent Items in the
data file for the account that you
NOTE You should first make sure
that you are subscribed to the Sent
Items folder so that it will appear in
the Internet E-mail Settings dialog
box as described in step 4. For
information about how to subscribe to
IMAP account folders, see the See Also