CTMM Update

[guruxp]

Issue:
There was a specific scenario for data collection where customers could not export tenant config on source tenants only without specifying a list of users.

Reason:
This change addresses the issue by making sure the CSV parameter is not mandatory on the parameter set used for SDP

Fix:
Removed the mandatory for CSV parameter under the parameter set used for CollectSourceOnly and added the logic to detect whether CSV was used or not and if used then pull the info for the users, otherwise just pull config only from source tenant.

Validation:
PS C:\CSS-Exchange\CSS-Exchange\dist> .\CrossTenantMailboxMigrationValidation.ps1 -CollectSourceOnly -PathForCollectedData c:\temp\ -LogPath c:\temp\CTMM2.log
WARNING: This script appears to be an unsigned test build. Skipping version check.

Transcript started, output file is c:\temp\CTMM2.log
Informational: Saving SOURCE tenant id to text file
Informational: Exporting the SOURCE tenant organization relationships
Informational: Checking if there's a published scope defined on the organization relationships to extract the members
Informational: CTMM organization relationship doesn't match for a cross tenant mailbox migration scenario
Informational: O365 to On-premises - af46d263-531d-481f-97af-ef4c9cf7ac13 organization relationship doesn't match for a cross tenant mailbox migration scenario
Informational: No CSV file was specified, only SOURCE tenant/org level configuration will be collected (no mailbox-specific data)
Informational: Source data has been exported. Compressing it into a ZIP file
Informational: ZIP file has been generated with a total of 3 files, and can be found at c:\temp\CTMMCollectedSourceData.zip so it can be sent to the target tenant administrator, however you can still access the raw data at c:\temp\3007261007
Transcript stopped, output file is C:\temp\CTMM2.log

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[Copilot]

Pull request overview

Updates CrossTenantMailboxMigrationValidation.ps1 to allow -CollectSourceOnly data collection without requiring -CSV, enabling config-only source tenant exports for scenarios where mailbox lists are not available/needed.

Changes:

• Updated comment-based help and examples to document config-only -CollectSourceOnly behavior when -CSV is omitted.
• Made -CSV non-mandatory for the CollectMode parameter set and updated help messages accordingly.
• Refactored -CollectSourceOnly execution flow to always collect org-level configuration, and conditionally collect per-mailbox data only when a valid CSV is provided.