You can also create a new PST file which will be displayed as a new tree
in Outlook Folder List. Click File (top Outlook menu), New, Outlook Data
File, Office Outlook Personal Folders. A new folder tree will appear in
your Folder list. Basically, you would need to create another Inbox folder
there and then use Outlook rules to move certain incoming messages to
certain folders. The messages that you already have in your Inbox can be
moved to a certain folder using a drag&drop method.
You can also keep all emails in the same folder but still have them
separeted. Learn more in this post:
http://outlook-center.com/forum/viewtopic.php?f=4&t=84&start=0&hilit=two+accounts
Hope this helps!
Regards, saymon