Today I upgraded CRM 2013 to CRM 2015. it turned out to be the easiest upgrade I’ve ever done.
Step 1.
- Backup your CRM databases. Do not forget the MSCRM_Config database.
Once the backups are complete, you are ready to upgrade.
Step 2.
- Mount your CRM dvd and select “Install Microsoft Dynamics CRM Server ”from the splash screen.

- During the upgrade process you will be asked to select an organization for upgrade.

If you have more than 1 organization, the other organizations can be upgraded later using the CRM 2015 Deployment manager.
- Next you will have to select service accounts

- Next step is to specify Email router settings

After this screen no more input will be required. you will just be clicking Next.
The upgrade took 1hour 15 minutes to complete(subject to hardware capabilities).