Outlook 365 - Cached Exchange Mode

Cached Exchange Mode is a feature built into Outlook that can make working with large mailboxes easier, but may cause delays in email being sent/received or prevent shared calendars from synchronizing.

Step-by-step guide

1. Right Click the inbox name and select Data File Properties
   
   

   
   
   

2. Click Advanced
   
   

   Open

   

   
   
   

3. Now select the Advanced tab
   
   

   Open

   

   
   
   

4. Make sure Cached Exchange Mode is unchecked

5. Click OK, and OK to save the changes

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