Export Outlook Folder to a .pst file
You can preserve/archive a folder structure by exporting from Outlook to a Personal Folder (.pst file).
NOTE: Some messages may not be cached locally in Outlook. To ensure you are exporting ALL messages before exporting, either sync all messages or create a new profile with no caching.
In Outlook, select the folder structure you would like to export
Select the "File" Tab and then Open & Export
Select Import/Export
Select Export to a file
Select Outlook Data File (.pst)
Verify that the appropriate folder is selected.
Note: To export your entire mailbox including calendar and contacts, select the root level folder which is usually listed as your email address.
Select Include subfolders
Choose where you would like to export the .pst file and the name of the exported file
Since this is a new file choose, Replace duplicates with items exported
Select Finish
It is recommended NOT to add an optional password. If you forget it, your data is lost forever.
NOTE: DO NOT open a .pst file that is residing on a network share. It is best to copy the .pst file to your local computer to the folder: Documents/Outlook Files