How to Auto Archive your Email in Microsoft Outlook.

http://www.dummies.com/software/microsoft-office/outlook/how-to-autoarchive-your-email-in-outlook-2016/

https://support.office.com/en-ie/article/Manage-my-mailbox-size-792b521c-3f4e-404e-b436-9c197bad6f45

https://support.office.com/en-ie/article/Archive-older-items-manually-in-Outlook-for-Windows-fa03020e-55af-4eeb-94fb-925f640d942d?ui=en-US&rs=en-IE&ad=IE