Cached Exchange mode
From CompanionLink Support
If your Outlook data is connected to an Exchange server, CompanionLink recommends syncing with Outlook's Cached Exchange mode turned on. Follow the links below to learn how to turn this feature on.
"Cached Exchange Mode provides you with a better experience when you use a Microsoft Exchange Server e-mail account. A copy of your mailbox is stored on your computer. This copy provides quick access to your data and is frequently updated with the mail server."