Outlook 2007 – with the lasted update installed – now supports multi-year recurrences. This means you won’t need to use 24 months to create appointments which recur every 2 years. Sorry, that is the only change to recurrence patterns. Maybe next time we’ll see quarterly appointments. I don’t think we’ll ever see fifth week in a month because making Outlook handle it correctly when there is not a 5th week in a month would be too difficult.
An update is available for Outlook 2007 that improves Internet Calendar functionality and improves compatibility with IMAP servers
//support2.microsoft.com/kb/950219
Published June 4, 2008. Last updated on June 17, 2011.