1. Start Outlook.

  2. On the File tab, click Account Settings, and then click Account Settings.

  3. On the E-mail tab, double-click your Microsoft Exchange account.

  4. In the Change Account dialog box, drag the Mail to keep offline slider to the desired number of months or to All to synchronize all email messages.

    Change Account

  5. Click Next.

  6. Click OK when you're prompted to restart Outlook to complete the configuration change.

  7. Click Finish.

  8. Restart Outlook.