Normally, SpamSieve puts the spam messages from all your Outlook 2011 accounts into a single folder called Junk E-mail.
If you want to have a separate spam folder for each account, first create the requisite empty folders.
Then, instead of the single SpamSieve - Move Messages rule described in the Setting Up Outlook 2011 section, create two rules per account. For example:
SpamSieve - Move messages - Account 1 - Junk
When a new message arrives: If all conditions are met:
Do the following:
SpamSieve - Move messages - Account 1 - Uncertain Junk
When a new message arrives: If all conditions are met:
Do the following:
And similarly create two rules for Account 2, etc.