Came across this weird and add problem today. Had a user constantly get a Security Alert(see below) in outlook everytime she opened it.
After hours of beatting my head on the table, pulling my hair, Googling different combination of words to try to get new info and everythread that I opened talked about Exchange PowerShell I stumbled across this - -> LINK <- -
Yes, it's just THAT simple
Fixed date and time and no more Security Cert Alert.