"<Custom filter>" is not a valid recipient filter for the default global address list "Default Global Address List". To upgrade the object's Exchange version, use "-RecipientFilter {((Alias -ne $null) -and (((ObjectClass -eq 'user') -or (ObjectClass -eq 'contact') -or (ObjectClass -eq 'msExchSystemMailbox') -or (ObjectClass -eq 'msExchDynamicDistributionList') -or (ObjectClass -eq 'group') -or (ObjectClass -eq 'publicFolder'))))}".

User's solution

This works!

Microsoft KB article
Error when you try to change the default global address list recipient filter in Exchange Server 2010:
http://support.microsoft....spid=13965

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