shared mailbox (exchange online) permissions change log

[CB1]

If amendments were made to a shared mailbox, e.g. new user granted access to the mailbox, existing user removed from access to the mailbox, is that activity logged anywhere in the 365 platform?

[#2 · Accepted solution]

@CB1 Hello, you can use mailbox auditing.

Manage mailbox auditing - Microsoft 365 Compliance | Microsoft Docs

[#3]

@ChristianBergstrom ok thanks, some of the descriptions in that article seem to suggest such actions (permissions amendments) should be captured. Is there a default timeframe for how far back the logs go? Or is it more based upon the number actions to a set threshold?

[#4]

@CB1 It's in the link (90 days by default), here Manage mailbox auditing - Microsoft 365 Compliance | Microsoft Docs