The record number of vulnerability fixes will also require system reboots.
The recent Slate PC demo at the Consumer Electronics Show is just Microsoft's latest foray in a long line of tablet device ventures.
Microsoft's president of entertainment and devices division tells analysts at CES of Redmond's three-pronged assault on mobile trendsetters Apple and Google.
Microsoft this week said it would include an advertising supported version of Office 2010 on new PCs.
Experts say Microsoft's big task for the coming year is clear: explain to enterprise IT folks precisely how and why they should live in a cloud.
A countdown of 13 of Microsoft's most important products of the past year.