If you have a need to launch multiple, separate instances of Outlook, you've most likely thought it was impossible. Until ExtraOutlook, that is. Using this tiny utility, and with a little bit of work on your part, you'll be able to do it.
To do it, you'll have to first create different Outlook profiles, and then configure Outlook to ask you which profile it should run when you launch Outlook from the command line. If you don't know how to do that, you can get. details on how to do it from Microsoft.
Once you've done that, find out where your Outlook.exe file is located, for example, C:\Program Files\Microsoft Office\Office12. Next, download and extract ExtraOutlook, open a command prompt and go to the directory where you've extracted it. At the command prompt, type this command (assuming that Outlook.exe is located in C:\Program Files\Microsoft Office\Office12): extraoutlook.exe "C:\Program Files\Microsoft Office\Office12\outlook.exe" Note that you'll need to use the quotation marks.
When you've done all that, you'll launch Outlook and be prompted for which Outlook profile to use. You can then launch Outlook again with the command, and tell Outlook to run with a different profile.
Note: This link takes you to the vendor's site, where you can download the latest version of the software.