Pros

Lots of cool technologies. Many leading products are developed at MS. Some teams value innovation, security and quality, but not all.

Cons

Crowded place, can get easily lost there. Incompetent managers. Review system sucks big time.
The work place can get very unfriendly because every because everybody fights for good reviews

Advice to Senior Management

Try to understand people better. Don't just copy other companies, foster innovation inside the company as well. The review system is crap