The data file has the pst extension and is used to store and restore your emails. We have already covered a tip on how to import and export the Outlook Data file. If you wish to create a personal folder for storing Outlook items on your computer, then you need to find where Microsoft has hidden the option to do so in Outlook 2010. Here are the steps to create a new Outlook data file quickly and easily.
Click on the Home tab and choose the New Items > More Items > Outlook Data File option.