I don't see anything specific to a rollup requirement for the Outlook Client side of the upgrade in the CRM 2013 IG. But it does recommend that you have all the security updates for Microsoft Office in place before starting the upgrade of the Outlook
Client.
You can download the IG from the following Microsoft link.
http://www.microsoft.com/en-us/download/details.aspx?id=40322
Outlook client upgrade section starts on page 198.
Jason Peterson