Force Update User's "thumbnailPhoto" from AD

Hello,

When we add/update a user "thumbnailPhoto" attribute directly to AD (without using Set-UserPhoto Command) the image doesn't show in OWA, unless the user log in his email and clicks on his name or open the options page.

which means that this is the only time when exchange reads the users "thumbnailPhoto" attribute.

Is there a way to force show/update user Image in OWA after updating it in AD "thumbnailPhoto" attribute?

Thanks.