Web results:
This folder is a combined inbox of all your email accounts, and out-of-the-box, it doesn’t exist in Outlook. Instead, you’ll have to click from inbox to inbox to check all your mail.
I use Outlook 365 on multiple devices and it works great except on my newly purchased Lenovo Yoga 730. The Outlook Inbox is not current and is several days behind. If I do a search for an email which I have seen on another of my devices, it will find it and I am able to send emails. However, the Inbox is not updating to include current emails.