O365

Symptoms

  1. You are backing up Microsoft Office 365 mailboxes.
  2. Backup finishes with warnings:
    .NET exception 'System.InvalidOperationException' has occurred: There is an error in XML document.
     
    Error code: 428
    Module: 91
    LineInfo: 0xF2DD8062218B0B1E
    Fields: {"$module":"arx_agent_fork_vsa64_3917"}
    Message: Some emails in folder 'XXXXXXXXXXXXXXXXXXX' will be skipped during backup.
    ------------------------
    Error code: 3101

Symptoms

While using the C2C Agent, you notice that one Backup took a lot of time to complete. When checking list of recovery points in Backup Console, you notice a slice is the same size as Full Backup taken originally or close to it.