Ensure that schema is present <or> that purging of schema values follows schema version

[timmcmic]

Customer reports that migrations are "failing" although successful. Review of logs indicates that this is due to attempting to clear a schema attribute not present in the current schema. Specifically the remote recipient type. This should have been present in the reported schema version of Exchange 2010 - but may be added later. Further research required.

[timmcmic]

Declined - investigation showed that the schema attributes should have been already present. Rather than a code change recommend downloading latest version of exchange and applying the schema.