"Office Professional Plus 2010 is available through Volume Licensing only."
From memory the 2007 version was also available only through the VLK as well. To get support is awkward as you have to contact the company that supplied this. In the VLK world you often find the only way to get access to the patches and support is back where you got this version.
Have recently discovered Tasks with reminders for 2054. Yesterday, I changed a reminder to a date in September 2011. It automatically changed to a corresponding date in 1967. I changed it again; it showed a date in 1968. What I don't know is if this occurs only on recurring Tasks. I am using Microsoft Office Outlook 2007 (12.0.6557.5001) SP2 MSO (12.0.6554.5001) Part of Microsoft Office Professional Plus 2007.