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Preview Features

Transend has included select software enhancement features that are continuing to be optimized in either functionality or UI design.

Preview features are included so customers can provide feedback through testing to help improve the overall experience and design of these features. All Preview features are designated with a (Preview) label.

Microsoft Graph API

Microsoft will begin phasing out Exchange Web Services (EWS) in Exchange Online in October 2026, with EWS scheduled to be fully disabled by April 2027. As a result, Microsoft Graph will become the primary API for migrating mailbox data to and from Microsoft 365.

To support this transition, Transend Migration Console 3.2 includes support for Microsoft Graph as an optional API selection, currently labeled (Preview).

Microsoft Graph support is fully functional; however, certain limitations inherent to the Graph API require additional consideration during migration. The most significant known limitation involves calendar data. When Microsoft Graph is used as the migration target endpoint, Microsoft 365 may automatically generate and send meeting invitations and updates to calendar attendees as events are migrated.

To prevent these unwanted calendar notifications (commonly referred to as a “calendar invite storm”) Transend provides two options:

  • Option 1 (recommended) – Enable the /D207 Custom option in Transend Migration Console. This option removes attendees from the calendar event header and adds them to the event body, preventing Microsoft 365 from generating and sending unwanted calendar notifications during migration.

    To enable the /D207 Custom option:

    • Navigate to the Settings screen.
    • In the Mailbox Options tab, check the Show hidden options checkbox.
    • Locate the Custom section in the bottom-right corner of the screen.
    • Enter D/207 into the Custom field.
    • Click Continue in the top-right corner of the screen to apply the setting.

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  • Option 2 – If you do not want to enable the /D207 Custom option, enable Exchange Online Transport Rules (mail flow) before beginning the migration. To prevent a large volume of unintended calendar notifications during migration, implementing temporary Transport Rules within the Microsoft 365 tenant will suppress these messages for the duration of the migration process.

    For assistance configuring the appropriate Transport Rules, please follow the defined steps to enable Transport Rules in Microsoft 365: