1. Mash Linkedin and Skype and create a Slack/Facebook For Business Competitor.

2. Integrate that with Office 360 for Business.

3. Create a much more appealing Resume/CV that either integrates well with hiring tools or competes directly with them (monster, indeed, so-on) by creating your own backend for recruiting.

4. Make it very simple to migrate your MS Live/Outlook/Skype profile to a Linkedin profile (or do it automatically ala Google+).

This makes advertisers happy. This makes any corp using Office 360 immediately integrate to Linkedin. This makes Linkedin much more appealing to candidates and recruiters. This could bring people over from competitor services. This actually makes the entire MS Office suite more appealing.

I don't have a LinkedIn account, and I would probably reopen one if I heard that they stopped their incessant spam emails. I'm surprised that they haven't been sued to MySpace and back for those email policies, which almost certainly are illegal in the United States. (This based on my experience, which ended 2 or 3 years ago when, after months of failed attempts, I managed to close my account.)