In most cases, we only need to run one instance of Outlook at one time. But if you ever have a need that running multiple instances of Outlook would help you greatly, look no further. Here is what you need to know and do.
Running multiple Outlooks with same profile
To do so, launch every single instance of Outlook without the /recycle switch. The default Outlook shortcut the installation process placed on your start menu has this switch in it, like below:
"C:\Program Files\Microsoft Office\Office14\OUTLOOK.EXE" /recycle
Taking out the /recycle will do the trick letting you run multiple Outlooks but with same profile.
Running multiple Outlooks with different profiles
Well, before you make this move, do you know Outlook 2010 already support multiple Exchange accounts? If hooking up multiple Exchange accounts is what you want to accomplish, you should set them up within one profile first and see if that works for you.
Simple click New… in the Email tab on Account Settings window, and walk through the wizard.
However, if you are running any of previous versions of Outlook or you still think running multiple instances works better, you would need a little help from this free neat tool called ExtraOutlook (direct download link) from this guy.
Extract the executable file to a place that’s easy to access. Directly accessing it will prompt you more information how to use the tool.
For example, I have ExtraOutlook.exe file saved in temp folder under c: drive, and Outlook installed in c:\program files\microsoft office\office 14\ folder. To run Outlook on both profiles "Kent Chen" and "W7H" side by side simultaneously, I run
c:\temp\extraoutlook.exe "c:\program files\microsoft office\office 14\outlook.exe" /profile "kent chen"
c:\temp\extraoutlook.exe "c:\program files\microsoft office\office 14\outlook.exe" /profile "w7h"
It works for Outlook 2003, 2007, and 2010, on Windows XP, Vista, and 7. Obviously, you can create shortcuts with this command to make your life even easier.