Turn Off Cached Mode for Shared Folders
In general “cached mode” should always be turned on. An exception is for users who connect to multiple
accounts – even if they are not large ones – particularly when calendaring is involved as “oddities” often result.
In these cases we recommend leaving cached mode turned on for the person’s main account, but turning it off
for the shared folders.
Shared folders include Exchange Public Folders, SharePoint folders, or another person's Exchange folders when you’re using Delegate Access. By default, when Cached Exchange Mode is turned on, a local copy of shared folders is downloaded to your computer.
1. On Outlook. Click File > Account Settings > Account Settings.
2. Click the Exchange account, and then click Change > More Settings.
3. On the Advanced tab, under Cached Exchange Mode Settings, unchecked the box beside 'Download shared folders' as shown below. Leave the 'Use Cached Exchange Mode' box checked.
4. Click the “Apply” button, the “Next” then “Finish”