Combined Profiles vs Separate

I am a long time user of outlook 2007 and am very used to selecting my email profile from the Profile Prompt (i have 6 email profiles / email addresses) and going into each one that way. Each one was its own little world. Its own PST file. Its own contacts list. Its own rules for directing emails to specific folders, and when I had a new laptop, I would port over the PST files individually and easily set things up on the new computer.

I am now being faced with Outlook 2010 which wants to combine everything into one basic profile. All my email accounts are appearing down the left sidebar and I am very uncomfortable with this. I am certain there is going to be some lost functionality. What about calendar alerts based on specific email address? What about separate contact lists? Surely this can't be a consolidated email structure that has 100% of the previous functionality, can it?

Please let me know what (if any) cons there are to using this consolidated method. I see that within windows (Control Panel) you can still set up unique profiles if I want to do it the old school way.

Thanks

Thank you for the reply. In comparing the old structure (selecting your email profile from a prompt, and going into its "own little world") to the new structure (everything combined) can you think of any other cons with the combined structure?

I use outlook for my business and dont want to invest hours setting it up a certain way, only to realize 3 months down the line that there's something I can only do with the "separated" structure.

I have to say there was a definite "mental" benefit to keeping them separate. I could mentally focus on one area of my business. Then when I was done - close that out, and reopen - and go into another world. And focus on that area. Each email is associated with a different part of my business web site. So keeping things exclusive and divided helped me organize.

Seeing everything down my left sidebar (we're talking hundreds of emails for each mailbox) is going to make me feel very overwhelmed.