All your emails stay on your server.
At no time does your emails leave your host’s email server. In other words, SaneBox never downloads your email nor does it upload your emails to your SaneBox Dashboard (account). All emails processed by SaneBox will always remain in your own personal (or work) email account.
Your Sane folders are server-side folders like your Inbox or Sent folder and so they’re available for you from all your client software or apps, and webmail too.
Note: Outlook 2015 for Mac was initially available for Office 365 subscribers and then also as a one-time Microsoft Office software purchase, as an alternative to an annual Office 365 subscription.
Locating your Sane folders in Outlook 2015 Mac
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Click on your email account to expand the folder list.
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With the mail folder tree expanded, do a Send & Receive. You should now see your Sane folders appear in the folder list section for the specific email account.
**If needed, try these extra steps
Some email software clients (Outlook included) have a “subscribe” process for showing additional IMAP mail folders. So sometimes you may need to complete these steps too. Note that for Exchange hosted email, these steps aren’t needed and do not apply.
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Go to theTools menu, click IMAP Folders.
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In the Folders list, click the Sane folder you want to subscribe to and click on the green (+)Subscribe button.
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Now you should see those Sane folders appear in the folder list.
Note: Outlook 2015 Mac preferences (from the Outlook menu on your menu bar) offer you the choice to either see unified mail folders for multiple email accounts (where inboxes and other server-side mail folders are grouped) or to have all of each email account’s folders together on their own branch of your mail folder tree. 
“New” Outlook for Mac
If you’re using the “New Outlook” view on your Mac and your folders aren’t appearing or syncing correctly, we have found that reverting to the old view will show the folders. That can be done by un-checking the “New Outlook” option in the Outlook menu:
If you prefer the “New Outlook” view, we have also found that you can get your folders to properly sync by removing your email address from Outlook and adding it back in.
Note: It’s always recommended to create a backup of your emails before removing your email account from an email client like Outlook, just to make sure everything is safe in case there are any items saved locally to Outlook.