a. Change Cache Mode Setting
· Start Outlook
· Click Account Settings on the File tab, and then click Account Settings
· In the Account Settings dialog box, double-click your Microsoft Exchange account on the E-mail tab
· In the Change Account dialog box, drag the Mail to keep offline: slider to the desired number of months
· Click Next
· Click OK when advised you have to restart Outlook to complete the configuration change
· Click Finish
· Restart Outlook