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    Migration from Exchange On-Premises

    Refer to the table below to view the supported and unsupported object types for Exchange On-Premises Migration.

    – Supported; × –Unsupported.

    Object TypeObject TypeObject TypeOn-premises Service Account Support StatusComment
    Mailbox
    User mailboxUser mailboxWhen the usage of mailboxes exceeds storage quota, they also can be migrated.
    Mailbox
    Shared mailboxShared mailboxWhen the usage of mailboxes exceeds storage quota, they also can be migrated.
    Mailbox
    Resource mailboxResource mailboxWhen the usage of mailboxes exceeds storage quota, they also can be migrated.
    Mailbox
    In-Place Archive mailboxIn-Place Archive mailboxIf the storage space of the destination archive mailbox is full during the migration, you need to make sure the auto-expanding archiving feature is enabled for the destination archive mailbox and run an incremental migration job to migrate newly created or modified source data every day.
    Mailbox
    Linked mailboxLinked mailbox
    Distribution listDistribution listDistribution list×
    FolderInboxInbox
    FolderSent ItemsSent Items
    FolderDeleted ItemsDeleted Items
    FolderDraftsDraftsThe time of the migrated draft items in the destination will be the migration time of the items when viewing the items via OWA.
    FolderArchiveArchive
    FolderConversation HistoryConversation History
    FolderNotesNotes
    FolderRSS SubscriptionsRSS SubscriptionsOnly the RSS Subscriptions folders can be migrated to the destination. The items in RSS Subscriptions folders cannot be migrated.
    FolderCustom FolderCustom Folder
    FolderJunk EmailJunk Email
    FolderContactsContacts
    FolderCalendarCalendarPartially SupportedThe Other Calendars are not supported in the migration.The link of a Skype for Business meeting on the calendar will not be replaced with the destination link after the migration. If you do not keep the domain of the source environment to the destination, enable the Replace email addresses of senders/recipients based on user mappings setting in the Exchange On-Premises migration policy to replace the recipients’ email addresses with the corresponding email addresses in the destination. However, in the following cases, source users are not replaced with the destination users after the migration:● When the organizer views the calendar item in the destination, the source organizer/attendees are replaced with the destination users, but when the attendees view the calendar item, the source users are not replaced with the destination users.Source users of calendar items created in a public folder cannot be replaced with the destination users due to API limitations.● Though attendees have accepted a calendar item in the source, after the migration, when the organizer views the migrated item in the destination, there is no user responding to the event, and the organizer is added to the Didn’t respond list. ● The source resource mailboxes in calendar items can be replaced with the destination resource mailboxes. However, the resource names displayed in the Location of the destination calendar items and meeting requests are still the source names.
    FolderJournalJournal
    FolderRecoverable Items foldersDeletionsThe Recoverable Items folders cannot be migrated to Microsoft 365 Group mailboxes.Fly can only migrate DiscoveryHolds folders of Exchange 2013 SP1 or later.
    FolderRecoverable Items foldersVersionsThe Recoverable Items folders cannot be migrated to Microsoft 365 Group mailboxes.Fly can only migrate DiscoveryHolds folders of Exchange 2013 SP1 or later.
    FolderRecoverable Items foldersPurgesThe Recoverable Items folders cannot be migrated to Microsoft 365 Group mailboxes.Fly can only migrate DiscoveryHolds folders of Exchange 2013 SP1 or later.
    FolderRecoverable Items foldersAudits×The Recoverable Items folders cannot be migrated to Microsoft 365 Group mailboxes.Fly can only migrate DiscoveryHolds folders of Exchange 2013 SP1 or later.
    FolderRecoverable Items foldersDiscoveryHoldsThe Recoverable Items folders cannot be migrated to Microsoft 365 Group mailboxes.Fly can only migrate DiscoveryHolds folders of Exchange 2013 SP1 or later.
    FolderRecoverable Items foldersCalendar Logging×The Recoverable Items folders cannot be migrated to Microsoft 365 Group mailboxes.Fly can only migrate DiscoveryHolds folders of Exchange 2013 SP1 or later.
    FolderRecoverable Items foldersSubstrateHoldsThe Recoverable Items folders cannot be migrated to Microsoft 365 Group mailboxes.Fly can only migrate DiscoveryHolds folders of Exchange 2013 SP1 or later.
    FolderTasksTasksIf you do not keep the domain of the source environment to the destination, enable the Replace email addresses of senders/recipients based on user mappings setting in the Exchange On-Premises migration policy to replace the recipients’ email addresses with the corresponding email addresses in the destination. However, the email address of the task assignee may not be replaced with the destination email address after the migration.
    FolderSync IssuesSync Issues×Sync Issues folders hold the synchronization logs that record any general problems or delays in syncing with the email server. These folders are skipped in the migration because they may contain many logs that will affect the migration performance and consume storage space in the destination.
    FolderSearch FoldersSearch Folders×Search folders are virtual folders that do not contain any actual items.
    FolderSnoozedSnoozed
    FolderHidden folderHidden folderPartially SupportedWhen the source folder is a hidden folder, note the following:● If the destination folder does not exist, Fly will create a hidden folder with the same name as the source, and migrate the data, properties, and structure of the source hidden folder to the destination hidden folder.● If a normal folder with the same name as the source hidden folder exists in the destination, Fly will only migrate the data in the source hidden folder to the destination folder without changing the properties and structure of the destination folder.
    Mailbox itemEmailEmail
    Mailbox itemPostPost
    Mailbox itemAppointmentAppointmentAppointment is a calendar item and follows the limitations of calendars.
    Mailbox itemMeetingMeetingPartially SupportedMeeting is a calendar item and follows the limitations of calendars.
    Mailbox itemContactContactPartially SupportedThe source contacts that have been added to favorites will not be marked as favorites in the destination after the migration.
    Mailbox itemTaskTask
    Mailbox itemNoteNote
    Mailbox itemJournal EntryJournal Entry
    Mailbox itemAuto-complete listAuto-complete listPartially SupportedThe auto-complete lists generated via Outlook Web Access cannot be migrated due to an API limitation.The auto-complete lists generated via Outlook for Mac cannot be migrated because Outlook for Mac does not synchronize the auto-complete lists from/to the Exchange. Refer to how the auto-complete lists features works in Outlook for Mac for more information.The auto-complete lists cannot be migrated to the destination when the service account/delegated app profiles’ consent users does not have the ApplicationImpersonation role.The auto-complete lists cannot be migrated from/to archive mailboxes or Microsoft 365 Group mailboxes.
    Mailbox item propertyAssign PolicyAssign PolicyPartially SupportedOnly the built-in archive policies and retention policies applied on emails can be migrated.
    Mailbox item propertyCalendar Access RightsCalendar Access Rights×
    Mailbox item propertyPin/UnpinPin/Unpin
    Mailbox item propertyFlagFlag
    Mailbox item propertyMark as Read/UnreadMark as Read/Unread
    Mailbox item propertyFollow UpFollow Up
    Mailbox item propertyCategoryCategoryPartially SupportedThe custom categories cannot be migrated to the destination.
    Mailbox item propertyTo-Do listTo-Do list×The property will no longer be supported due to Microsoft’s changes.
    Mailbox item propertyReply status of meeting participantsReply status of meeting participants×
    Mailbox delegationsUser mailboxUser mailbox×
    Mailbox delegationsResource mailboxResource mailbox×
    Mailbox delegationsShared mailboxShared mailbox×
    Mailbox delegationsDistribution groupDistribution group×
    Outlook settingsOutlook configurationUser profiles×
    Outlook settingsOutlook configurationSignatures×
    Outlook settingsEmail forwardingEmail forwarding×
    Outlook settingsOutlook quick action settingOutlook quick action setting×
    Outlook settingsAutomatic Replies (Out of Office) settingsAutomatic Replies (Out of Office) settings
    Outlook settingsInbox rulesInbox rulesPartially SupportedRefer to Supported and Unsupported Outlook on the Web Rules and Supported and Unsupported Outlook Rules for details.Rules are migrated based on their names. After a rule is migrated, if you change the name of the source rule, it will be migrated again in the incremental jobs.