If your company merged its Skype and Messenger contacts, you must now log in to Skype using your Microsoft login information in order to see an updated list containing both your Skype and Messenger contacts.
Other issues apart from the Messenger-Skype migration can also cause problems when trying to update contacts.
You will continue to have access to your existing email, contacts, and calendar data that is currently stored in Windows Live Mail 2012 on your personal computer.
Msn messenger not updating
Choose "My Apps." If you're not running the most recent version of Messenger, it'll be listed under "Updates." Tap the app and select "Update." Also check the settings on your Messenger app, to ensure that you've set up notifications -- its possible that your messages are arriving, but that your phone isn't sending notifications.
Microsoft merged MSN Messenger with Skype in April 2013.
The built-in Mail app on Windows is the recommended replacement for Windows Live Mail 2012 and is the most-used email application among users today.
It's designed to work with the new Outlook.com, offers a more modern and touch-friendly interface, and integrates elegantly with the Windows platform.
Now Microsoft has decided to retire Delta Sync protocol and the company is planning to replace it with Exchange Active Sync (EAS) protocol which is also used by Microsoft Outlook program.