Internet Explorer 9 - 40% of users reporting a status of 'update is not required'

[SMELTS]

Currently in the process of deploying IE9 to about 1000 users as a software update. 400 of these users are reporting a status of 'update not required'. The other 60% are reporting required and have installed IE9 correctly.

Workstations are all standard running the following:

• Windows 7 x64
• Internet Explorer 8

What might be worth noting is that we only release security / critical software updates, regular windows updates are not deployed so we're missing about 30 or so.

Any help would be great.