We also seem to be experiencing the issues decscribed in KB983492.
Running Get-ExchangeServers also displays build at 14.1.218.15.
However when running Get-ExchangeupdateRollups.ps1 as advised by http://social.technet.microsoft.com/wiki/contents/articles/exchange-server-and-update-rollups-builds-numbers.aspx the build numbers returned are correct 14.1.255.2