How to force outlook download all items from exchange server after I clear all the offline emails.

I try to clear the cache to see if i can get all the emails shown in my outlook.

i right click on my inbox folder to get this popup window





then click on the clear offline itmes, then all my emails are gone from my outlook window.

I try to use update Folder button from the SEND/RECEIVE menu




but the Inbox did not load any items from exchange server.

after consult with the network administration, here is the solution

1. go the folder that store the outlook data file

C:\Users\YourUserName\AppData\Local\Microsoft\Outlook

2. rename the Outlook Data File to other name, then close the outlook and skype for business.

3. re-launch the outlook application, boom the outlook will rebuilt the outlook data file and download all the emails items from the exchange server.