When Microsoft bought Skype we all knew it was a matter of time before Microsoft integrated all its online messaging services with Skype. It was supposed to happen March 15 but, that has now been delayed to April 8. That is the day Microsoft will start upgrading all Messenger accounts to Skype.
The upgrade process will take a couple of weeks after which time Messenger will be retired. But, you don’t have to wait until April 8th, you can move to Skype today and avoid the rush. A good idea just in case you have technical problems. All you have to do is upgrade to the latest version of Skype using the instructions below and sign in using a Microsoft account(this is the same ID you use to sign into Messenger). Once signed in, your contacts will already be there. You’ll be able to instant message and make video calls with them just like before, and start trying out new ways of staying in touch, including Skype on your mobile or tablet. I suggest you upgrade your mobile devices as well, you will be able to sign into Skype on your iPhone, iPad, Android, Windows Phone 8 mobile apps with your Microsoft account.
Until the upgrade process is completed around the end of April, Messenger will continue to work as you know it today. If you are signed in with Messenger on your Windows and Mac desktops you will see a banner notification to upgrade after April 8 (banner will only appear in latest version of Messenger for Mac). When you click on the banner, an installer window will open with the request to upgrade, this will take you through the installer flow, to install Skype and automatically uninstall Messenger. Once the upgrade cycle is completed Messenger users on Windows and Mac desktops will not be able to sign in and will only be able to upgrade to Skype. If you attempt to sign in, a notification will appear, and if you continue, you will be taken through the installer flow, to install Skype and automatically uninstall Messenger at the same time. Messenger on mobile devices will continue to work for some time to come but, you may as well upgrade all your devices to Skype at the same time.
If you run into problems or need help with the conversion you can visit the Skype Support Site, I found it to be pretty complete.