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Office 365 Activity
if we enable the unified audit log will it only show the new auditing information or the past one as well?
Is it the same thing for mailbox auditing? if we enable it for all mailboxes will it show ...
It's only new stuff, not old stuff. It can also take a little while
before the unified log is enabled and usable (you get a message when you
enable it). Same holds true for mailbox auditing, it takes a little bit
of time for it to become 'enabled' and capturing audit events.