to have a favourite folders list on the top left column so that you no need to go down to individual mailbox folder. you can add the individual mailbox any folder to be shown on the favoutite folders list. this feature outlook 2007 already have it.
You can use “search folders” under “smart folders”, jsut create one and give it filters you want and only emails that pass these filters will be shown in that folder.
You can create as many of them as you want.