For last three days or so, when I do a search within email account, no results are being received. Search terms I know are present and it will "no messages matched your search". I can't find anything that suggests others are having this same issue and it is really frustrating. I have to send a reminder email to customers and currently have no way of searching for the 5 customers whom I need to send this mail to as search function not working. 

Please advise