KB3161916 Published to address issue with migrating from legacy to modern public folders


Customers currently in the process of finalizing a migration from legacy Public Folders in Exchange 2010/2007 to Modern Public Folders in Exchange Online or Exchange 2016/2013, should read KB3161916. We’ve identified a scenario which, although it doesn’t appear to be common, could result in a loss of data.  If you have previously completed a migration of legacy to modern public folders and believe you may have encountered data loss, please contact support services for additional assistance.

Exchange Team


Comments (10)
  1. So it is related to a segmented PF database infrastructure, but not if you use a single PF database?

  2. Bhalchandra Atre-MSFT says:

    @Thomas, correct, single PF Database environments won’t be affected by this issue.

  3. Aman Saxena says:

    Thanks Team for sharing this information….

  4. ilantz says:

    Thanks for the fix :)
    Any updates you can share about migrating Modern Public folders to Exchange Online?

    1. Michael Griffith says:

      That’s what I’ve been waiting for. I moved my public folders from Exchange 2007 to Exchange 2013. Now I want to move them to Exchange Online but I can’t (now without some 3rd party service).

  5. Kirk Delaney Miller says:

    How i go by modern my files and e-mail together

  6. Uwe says:

    Any experience in the migration of 500GB in 50.000 PublicFolders to Modern PF ?
    Source is Ex2010Sp3 latest RU.
    How long does it take?

    1. Søren Krogsgaard says:

      I did a migration for a customer a couple of months ago.
      Customer had 5000 Public folders, with a total data size of 950gb.
      initial sync took around 12 hours to complete with batch migration.
      Finalization took around 1 hour to complete. All PF servers was in same site.
      Was migrating from Ex2010 to Ex2013 with the latest RU/CU at the time of the migration.

      Be sure to check logs before completing migration, and fix the errors you probably will encounter.

  7. ITVisionIT says:

    Has this been addressed in the latest CU13 for Exchange 2013?

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