When I login to Outlook Exchange for office email not all emails display. I use Safari on a home Mac. My PC at work shows all emails in the inbox

This problem started a couple of months ago. I only receive about 25% of my inbox when I login remotely to the webmail exchange account. My inbox on my office PC is fine but the emails do not display in my inbox when I login to the webmail exchange account. THis happens on other Mac computers, not just my personal computer at home. It's the same thing when I login from my gym