Remove backup files after Microsoft Office 2021 upgrade

If you exported your Microsoft Office 2016 files to upgrade to Office 2021, you may want to delete these unnecessary files after the import is successful. The PST backup files can be large so you may want to reduce the space used.
  1. In
    Outlook
    , open the
    File
    menu and select
    Info
    , then
    Account Settings
    , and
    Account Settings
    a second time.
  2. On the
    Account Settings
    screen, select the
    Data Files
    tab then
    Open File Location
    .
  3. In the
    File Explorer
    window that appears, select
    Documents
    from the list of folders, then double-click the
    Outlook Files
    folder.
  4. Select and delete each PST file you no longer need.

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