Switch Outlook from Cached Mode to Online Mode

Have you received an e-mail on your phone / Outlook for the web that you haven't received on your Laptop / Desktop Outlook client? Do you have a text warning on your Inbox that reads "This folder was last updated..." referring to sometime in the past? You may be experiencing a caching issue. In most cases, the quickest and simplest solution to this is to configure Outlook in "Online" mode. Follow these steps:

From within Outlook:

1. Click File > Account Settings > Account Settings

2. Click your e-mail address on the “Email” tab and click “Change”

3. Un-check “Use Cached Exchange Mode”. Click through the remaining dialog pages to confirm and close. Restart your Outlook client immediately afterwards as prompted. See below for differences in Outlook version.

Outlook 2010

Outlook 2013+