OutlookでのCloudM Migrate移行日付の修正
CloudM Migrateの移行がOutlookで間違った日付を表示する理由
CloudM Migrate handles メールボックス transfers by downloading messages from the source system and uploading them to the destination. When the destination is a Microsoft Exchange or Microsoft 365 environment accessed through Outlook, each uploaded message receives a new Receivedヘッダー from 宛先メールサーバー. This Receivedヘッダー contains the timestamp of the migration, not the original delivery date.
Outlook desktop determines the date displayed in 受信トレイ by reading the most recent Receivedヘッダー in each email's ヘッダーチェーン. Since the CloudM migration header is the newest, Outlook shows the 移行日 for every single message. The original Dateヘッダー still exists within the email, but Outlook prioritizes the Receivedヘッダー for its "Received" column display.
This is 特に problematic for ユーザー who rely heavily on Outlook's date-based sorting and search. After a CloudM migration, 受信トレイ becomes an undifferentiated mass of messages all stamped with the same date. Finding a specific email from a specific time period requires opening each message individually and checking the original Dateヘッダー manually, which is completely impractical for メールボックス with thousands of messages.
Outlookへの影響
Outlook's "Received" column shows the 移行タイムスタンプ for every email. Date-based sorting becomes useless because all messages are grouped under a single date. The "Arrange by Date" view, which is Outlook's default, presents the entire メールボックス as one flat block instead of the familiar chronological groupings (Today, Yesterday, Last Week, Last Month, Older).
Outlook's Quick Search and Advanced Find features are impacted when filtering by date. Users who search for "emails received last month" or "emails from January" get no results (or all results, depending on when the migration occurred) because Outlook searches against the corrupted Received date. Outlook rules that process emails based on when they were received also malfunction. Auto-archive settings that move emails older than a certain date fail because Outlook sees every email as having the same recent received date.
よくある質問
Does CloudM Migrate affect both sent and received emails in Outlook?
はい。 CloudM migrates both inbox and 送信済みアイテム, and 宛先サーバー adds a Receivedヘッダー to every uploaded message. Both sent and received emails display the 移行日 in Outlook after a CloudM migration.
Can I fix CloudM dates without losing my folder structure?
はい。 Redate.io preserves the entire folder structure, labels, flags, and read/unread status. Only the Receivedヘッダー and INTERNALDATE are corrected. The email content, attachments, and folder placement remain exactly the same.
How long does it take to fix a メールボックス after a CloudM migration?
Processing time depends on メールボックス size. Redate.io scans メールボックス to identify affected emails, then processes each one. A typical メールボックス of 10,000 emails can be fixed within a few hours, running entirely in the background.