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I can't migrate a mailbox to Exchange 2010 due to 'corrupt' mails

  • Type: Knowledgebase
  • Date changed: one year ago
Solution #00007580

Scope: ArchiveOne Enterprise, all versions



When migrating a mailbox from Exchange 2003 (or Exchange 2007) to Exchange 2010 SP1 the migration process can fail if the mailbox contains 'corrupt' mails. The process can be set with a value for the number of corrupt mails that will be allowed in the migrated mailbox.

However it has been observed that, in some cases when migrating a mailbox that has been archived using ArchiveOne, the operation fails because all of the message 'stubs' are flagged as being 'corrupt' mails. The root cause of this issue is that the archived message stubs contain a MAPI property that Exchange 2010 SP1 does not recognize as being valid. Prior versions of Exchange (including the non-service pack version of Exchange 2010) allowed this MAPI property.

Barracuda has amended ArchiveOne (starting from version 5.8) so that this property is no longer present in newly created stubs. In addition, running a Message Link Reconfiguration policy in any version of ArchiveOne Enterprise from v6.3 onwards will automatically remove the deprecated MAPI property (prior versions required a registry change to perform this action).

For advice on migrating the 'corrupt' messages, see:

PRB: Mailbox with archived items cannot be migrated to Exchange 2010 due to too many 'corrupt' messages

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