Recently, I've faced an issue with Microsoft Outlook and started searching for the solution. For god's sake, I got a very good solution from the below URL.
It may be useful for my blog readers too.
http://social.technet.microsoft.com/Forums/en/office2010/thread/4c8780f5-bbb9-449d-a1fb-2ab668fcceb3
1. Exit Outlook.
2. Go to Start > Control Panel, click or double-click Mail.
Mail
appears in different Control Panel locations depending upon the version
of the Microsoft Windows operating system, Control Panel view selected,
and whether a 32- or 64-bit operating system or version of Outlook is
installed.
The
easiest way to locate Mail is to open Control Panel in Windows, and
then in the Search box at the top of window, type Mail. In Control Panel
for Windows XP, type Mail in the Address box.
Note The Mail icon appears after Outlook starts for the first time.
The
title bar of the Mail Setup dialog box contains the name of the current
profile. To select a different existing profile, click Show Profiles,
select the profile name, and then click Properties.
3. Click Show Profiles. Choose Prompt for a profile to be used.
4. Click Add.
5. Type a name for the profile, and then click OK.
6. Start Outlook, and choose this new profile. Create a new message and send to yourself in this profile.Cheers,
Venkatesan Prabu .J
Head, KaaShiv InfoTech
http://www.facebook.com/KaaShivInfoTech