Outlook 2016 not synching

Outlook version
Outlook 2016 32 bit
Email Account
Exchange Server
I have a user who was having issues with Outlook so we renamed the .ost file.
Now after the initial open, her Outlook will not auto synch unless she clicks on update folder.
Also, at the bottom of her outlook in the status bar, it is still updating contacts and sent items. Would this cause the synch to be not working? Thanks