Changing the retention period of a mailbox in Outlook

When migrating from Hosted Exchange to Office 365 I needed to migrate the mailboxes of users. As the number of users were limited I decided to do a quick and dirty export / import using a .pst file. After the fist mailbox I did a quick check to make sure all data had been migrated correctly. I noticed that the mail only went back one year. It turns out that by default the offline mailbox retention period is set to a year. To do a complete data migration you need to change this to all mail.

To change the retention period follow these steps:

  • Open Outlook.
  • Click File.
  • Click Account configuration.
  • Click Account configuration…

    Open Account settings

    Open Account settings

  • Double click the email account you want to change the retention period of.
  • Move the slider of the Offline settings all the way to the right
  • Click Next >.
  • Click complete.

That’s it. Give it some time to synchronize all the data locally.

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