Exchange Unicode Mode - Ignore OST Format

Specifies whether to use the format of the user's OST file to determine whether to run in Unicode or ANSI mode, and optionally specifies whether to automatically create a new OST file if needed or to prompt the user before creating it.

Supported on: At least Windows Vista
Choose whether existing OST format determines mailbox mode


  1. OST Format determines mode
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Microsoft\Office\12.0\Outlook\EMSP
    Value NameIgnoreOSTFormat
    Value TypeREG_DWORD
    Value0
  2. Create new OST if format doesn't match mode
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Microsoft\Office\12.0\Outlook\EMSP
    Value NameIgnoreOSTFormat
    Value TypeREG_DWORD
    Value1
  3. Prompt to create new OST if format doesn't match mode
    Registry HiveHKEY_CURRENT_USER
    Registry PathSoftware\Policies\Microsoft\Office\12.0\Outlook\EMSP
    Value NameIgnoreOSTFormat
    Value TypeREG_DWORD
    Value2


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