SharePoint Migration Steps

1. Migration from MOSS 2007 to SharePoint 2013

There is no direct upgrade path from 2007 to 2013. You have to migrate via 2010

2. Migration from MOSS 2007 to SharePoint 2010

Run preupgradecheck command to identify any issues on MOSS 2007 environment.

stsadm –o preupgradecheck

Perform a backup of existing MOSS 2007 content database using SQL server management 
studio from Source Database Server( MOSS 2007 DB Server). 

Restore the Content Database in destination SQL Server using SQL server management 
studio. 

Connect to SharePoint 2010 farm. Go to CA. Create a new Web Application 

Remove the Content Data Base of Web Application. This step can be done using CA or 
using stsadm -o deletecontentdb

Add the Content DataBase that was attched in MOSS 2007 Server web application using 
AddContentDB. You can also use powershell Mount-SPContentDatabase command to attach 
content database.

Before attaching the content databases to the Web application, run the Test-SPContentDatabase command. It displays all missing features warnings.

Now browse the newly created web application in SharePoint 2010 server farm.


3. Migration from SharePoint 2010 to SharePoint 2013

Install SP 2013 Server farm

Create a new web application in SP 2013

Backup your content database in SP 2010 SQL Server

Restore SP2010 database into SP 2013 SQL server

Run Mount-SPContentDatabase command to attach content databases to new web application of SP 2013

Perform upgrade site collection to achieve new SP 2013 Look and Feel. site actions -> site 
settings -> Select Site Collection upgrade