How to Make a New MS Outlook Archive File. The Microsoft Outlook program, which is a part of the Microsoft Office software suite, stores email data in archive files with .pst extensions.

Create an Outlook archive In Outlook 2007, click File > Archive, select the folder you want to archive, and choose a date in the drop-down menu next to "Archive items older than." ...

Click "File" in Outlook 2007 and select "Archive." Click "Archive This Folder and All Subfolders" from the Archive window. Click the folder you want to archive, such as your Inbox folder.