Why are Personal Distribution Lists not migrated?

Why are Personal Distribution Lists not migrated?

Note: Personal Distribution Lists are now called Contact Groups in Office 365.

Answer:

Exchange Personal Distribution Lists (Personal DLs) allow users to create lists of recipients. We do not support migration of personal DLs for two reasons:

  1. No API support: Microsoft’s official position is that programmatic access to Personal DLs is not supported. This means that there is no support for reading or creating Personal DLs using web-accessible APIs.
  2. Technical limitations: Personal DLs specify members using complex binary properties. These properties specify the entry IDs of contacts, internal users, private/public distribution lists, and one-off email addresses. All entry IDs become invalid after migration to the destination system. For example, a member public DL may not be available at the time of migration while a member contact may have a different entry ID, etc.

We are currently unable to migrate Personal Distribution Lists (Contact Groups).

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