20 Essential Tricks Every Outlook User Needs to Know
Are you stuck using Outlook at work? We feel your pain. Compared to the alternatives, like Mozilla's light-weight and customizable Thunderbird client, Outlook is slow, bloaty, and downright unwieldy. Add to the fact that it isn't free and Outlook doesn't appear to have much going for it.
But whether you use Outlook because you have to or have grown accustomed to its interface and are reluctant to switch (or maybe you just want to justify the cost of Microsoft Office), we have some tricks to help you manage your email and contacts like a pro. After all, if you're going to use Outlook, no matter what the reason, you might as well get the most out of it, and we're here to help you do just that.
Live on the Edge: Access Blocked Attachments
When it comes to security, we don't condone throwing caution to the wind, and so we're content to let Outlook block file types it deems potentially harmful. But maybe you have a legitimate reason for wanting to receive .txt and .exe file attachments, or maybe you'd rather rely on your own good sense rather than let Outlook make that judgment call for you. No matter what the reason, you can configure Outlook to let through any file types you specify, just be warned that by doing so, you're also making it a little easier for malware writers to gain access to your machine. if you're okay with that, then keep reading.

You'll need to dip inside your system's registry, so if you're running Vista or Windows 7, bring up the Start menu and type Regedit. XP users can get there by going to Start>Run and typing in Regedit.
Navigate to HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security if you're using Outlook 2007. Outlook 2003 and 2002 users will navigate to the same general location, but instead of 12.0, change the folder to 11.0 and 10.0, respectively.

In the right-hand pane, right-click and select New>String value and name it Level1Remove. Finally, double-click the new string and in the Value data field, enter the file extensions you wish to allow, separating the entries by a semicolon.

For the change(s) to take effect, you'll need to close and re-launch Outlook. Once you do, you'll be able to receive whatever types of file attachments you indicated above. Just be warned that you're now more susceptible to malware, so be absolutely certain the file you're downloading is legit. It also doesn't hurt to scan any downloads with your antivirus program.
Integrate Your Twitter Account

One of the great things about Twitter from a usability standpoint is its ability to be updated from a multitude of sources, and Outlook is no exception. The integration comes courtesy of TwInbox (formerly known as OutTwit), which allows you keep your followers in the loop, 140 characters at a time.

To use it, download the free plug-in here and install it. The next time you fire up Outlook, you'll see the TwInbox toolbar added to your client. Click on the TwInbox pulldown menu and select options, then enter in your Twitter account credentials.

Before hitting the OK button, be sure to configure the other tabs as well. Under the Receiving tab, for example, you can setup TwInbox to place incoming Twitter messages in whatever folder you want, as well as assign color categories to new messages. If you're a heavy Twitter user, you may want to have TwInbox fetch new messages every minute -- the shortest interval available -- or once every hour if you're a casual user. You can also have TwInbox automatically shorten URLs with TinyURL, though we'd prefer if the service used bit.ly instead.

When you're ready to post a new update, just punch the New button and type in your message (you can add pics this way too). In the upper-right corner, you'll see how many characters you have remaining. Pretty slick, eh?