I've installed the Office for Mac 2011 Home & Student in my Mac, and i want to upgrade it to the Home & Business to use the Outlook. But the option to purchase the license key doesn't appears in the "word" menu like indicates in the tutorials. Could someone help me sending the link where i can purchase the license key to the upgrade, or telling me what to do?

There is a detail, I'm in Brazil, I think it don't change anything to purchase, but its better let you know.

Thanks
I recently purchased a MacBook Pro with Mountain Lion installed.  I added Office for Mac: 2011, Home & Business.  OS and Office fully updated.

I have an IMAP e-mail account.  Outlook is not connected to an exchange server.

There are messages not showing up in Outlook that are showing in my inbox on the server.  

Troubleshooting steps:
Used Microsoft Database Utility to rebuild my Identity.
Used Microsoft Database Utility to create a new identity.
Deleted ALL Identities and rebuilt a new one.
Configured Mail to connect to same server without issue and no missing messages.
Removed all filters.

Additional information:
Status bar indicates "All folders are up to date."
Status bar indicates "Connected to mydomain"
Enabled Schedule "Send & Receive All" and added action to Receive Mail.
When I do a "Send & Receive All" from schedules, Outlook indicates downloading 6 messages, but the server has 10 messages in the user's inbox.  She has 4 messages in Outlook.  That does total 10.