When you configure an Outlook 2013 account to use Cached Exchange Mode, Outlook 2013 works from a local copy of a user's Microsoft Exchange mailbox that is stored in an offline data file (file) on the user's computer, together with the Offline Address Book (OAB).
The cached mailbox and OAB are updated periodically from the Exchange Server computer.
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The user can select Cached Exchange Mode or Online Mode during account setup or by changing the account settings.
Summary: Configure Outlook 2013 for Cached Exchange Mode so users can access their recent Exchange server email messages offline.
Summary: Learn about the two Exchange connectivity modes that you can use for Outlook 2013 deployments—Cached Exchange Mode and Online Mode.
Audience: IT Professionals Decide which connectivity mode, Cached Exchange Mode or Online Mode, is appropriate for your environment.
The only way around this is to have Outlook literally point at each IMAP inbox for which you want instant delivery of emails.
If you are willing to leave all of these Outlook windows open during your session, you will receive your IMAP-account emails very quickly.
If you want to turn off Cached Exchange Mode, repeat the steps, but clear Use Cached Exchange Mode.