The following is a list of attributes I tracked that change for an AD user when their associated mailbox is moved (via hybrid) to Exchange Online…
- homeMDB
- legacyExchangeDN
- mDBUseDefaults
- mS-DS-ConsistencyGuid
- msDS-ExternalDirectoryObjectId
- msExchCalendarLoggingQuota
- msExchELCMailboxFlags
- msExchHomeServerName
- msExchMailboxSecurityDescriptor
- msExchRBACPolicyLink
- msExchRecipientDisplayType
- msExchRecipientTypeDetails
- msExchRemoteRecipientType
- msExchUserCulture
- proxyAddresses
- targetAddress
- uSNChanged