If you have more than one account in Outlook, you can simplify your inbox by unifying them into one.
Add an account to Outlook for Mac
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              If you only have one account added to Outlook, you can add another by clicking Tools in the Mac toolbar, then clicking Accounts. 
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              Click the Add an account (+) button and then click New Account. 
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              Follow the steps you're presented with to add another account. 
Access your unified Inbox
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              Once you have multiple accounts, go to All Accounts to the left in the Mail tab. If it isn’t expanded, click the drop-down arrow to the left of All Accounts. 
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              Click on Inbox under All Accounts and you’ll see emails from all your email accounts in that Inbox. 
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              To look at email from just one of your accounts, go to the Inbox under that account. 
 
                         
				 
				