I used to have Office 2013 so the PST file was from that program. I decided to use Office 365. All my email addresses work except from one account that I have on Gmail (on another machine, I can get email from this account).
On my Gmail account, I can’t determine if any email is syncing from the Gmail account. In fact, this account shows that the last email ( I sort by date, newest first) is dated 11/16/2012.