Can't connect to a mailbox after it's re-enabled in Exchange Server

Applies to: Exchange Server 2016 Enterprise EditionExchange Server 2016 Standard EditionExchange Server 2010 Enterprise


After a user's mailbox is re-enabled in an Exchange 2016 or Exchange 2013 environment, the user can't access their mailbox by using one or more client protocols.
When a user account has the Exchange mailbox disabled, the following Exchange attributes aren't removed from the user object:
  • msExchAddressBookFlags
  • msExchBypassAudit
  • msExchPreviousRecipientTypeDetails
  • msExchProvisioningFlags
  • msExchRecipientSoftDeletedStatus
  • msExchUMDtmfMap
  • msExchWhenMailboxCreated
  • protocolSettings

Use the Set-CASMailbox cmdlet to enable the client protocol that's required for the user to connect to their mailbox. For example, to enable Outlook Anywhere for the user, run the following cmdlet:

Set-CASMailbox Jim -MAPIBlockOutlookRpcHttp:$False