Good afternoon, all!
I have been tasked with validating and cleaning up a customer's ADSS structure. One of the things I've found is that there are some orphaned SIDs that refer back to an obsolete Exchange installation and transporting Exchange information between sites. I don't have info on how on-prem Exchange was decommissioned; I do know that's a nice area to injure yourself. My preference in the past has been to decommission all but one on-prem server, shut that one down, but leave all the AD-Exchange stuff to make managing O365 a little easier.
Question is - would archiving and deleting those entries be a bad thing for ADSS?