Mailboxes are often very large and can easily be pared down
by employing built-in Outlook archiving tools. Complete the steps below to
archive messages for the old account prior to starting the migration procedure
below.
Open Outlook on the PC used by the
individual you would like to migrate.
Go Tools>Options…
Select
the Other tab.
Click AutoArchive…
Configure
the AutoArchive settings using the sample below:
Click Ok to close the dialog box.
Click Ok to exit the options menu.
Go to File>Archive…
Choose
the option Archive all folders
according to their AutoArchive settings and click Ok.
After
a few moments the archive process will begin and show a status in the
lower right corner of the Outlook window. Wait for the process to complete
and then continue to the next section.