I'm having the same problem. Did you find a fix to this?

YOU CAN DO THIS.

It's a little bit fiddly but here's how:

Create all of your different mail accounts (Tools\E-mail Accounts) and then create a new Inbox for each account. Mail me if you need help with this too.

You'll need to do the following for each account that you want to use as an alias.

Then........Click on Tools\Rules and Alerts
Click on New Rule then check "Start from a new rule"

Highlight "Check messages when they arrive" and click Next
At step 1 - tick "Through the specified account" and "On this machine only"
At step 2 - click on the word "specified" and select the email account to apply this to & click OK then click on the word "specified" again and select the folder/inbox to apply this to and click OK
Click Next and Next again without making any further changes

Give it a name (just for your own reference) and ensure that "Turn on this rule" is checked. You can also tidy up your inbox straight away by ticking "Run this rule on messages already in "Inbox""
Click FINISH

Repeat it for each email address you want to apply this to and click OK

Rob Dore
www.comology.co.uk

In the event you want to first set up an alias I wrote a how to article on creating aliases on outlook.

http://www.copycontacts.com/outlook/aliases/