читал.
'The Update-StoreMailboxState cmdlet forces the mailbox store state in the Exchange store to be synchronized with Active Directory. In some cases, it's possible that the store state for a mailbox to become out-of-sync with the state of the corresponding Active Directory user account. This can result from Active Directory replication latency. For example, if a mailbox-enabled user account is disabled in Active Directory but isn't marked as disabled in the Exchange mailbox store. In this case, running the Update-StoreMailboxState will synchronize the mailbox store state with the state of the Active Directory user account and mark the mailbox as disabled in the mailbox store. You can use this command to troubleshoot issues that may be a result when the store state for a mailbox is unexpected or if you suspect that the store state is different than the state for the corresponding Active Directory account.'
повторюсь, это не про ваш вопрос.