Sometime after being switched to Outlook.com, I seemed to have lost the ability to retain pages of emails in my inbox.  I used to have pages of emails available for viewing.  Now I only have one page of about 18 emails or so.  If I search for a keyword, sender name, etc. of the older emails, I can find it.  Why can't I keep them in my inbox for easy viewing?   Why am I only able to view my last 18 emails or so before they get dropped off.  Some of them were important to me.