| Type of File | Name or Extension |
| Personal Folders | .pst files |
| Outlook Bar shortcuts | .fav files |
| Rules Wizard rules | .rwz files |
| RSS subscription names | .sharing.xml.obi files |
| Known feed list for RSS | .xml.kfl files |
| Nicknames | .nick files |
| Customized toolbar settings | outcmd.dat |
| Customized system folder views | Views.dat |
| Macros and VBA programs | VbaProject.otm |
| Signatures | .rtf, .htm, and .txt files |
| Stationary | .htm files |
| Templates | .oft files |
| Dictionary | .dic files |
| Stores a reference to which extensions (addins) you have loaded. |
extend.dat files |
