SharePoint 2010 to 2013 Upgrade: How to migrate SP2010 to SP2013. List of useful articles

I have just started to prepare for full-blown migration to SP2013.

From simple to complicated scenarios and thoughts:

 Simple one:

Step-by-step instruction on SP upgrade:

Upgrading from SharePoint 2010 to SharePoint 2013 Step by Step

What if you need to upgrade SP2007 to 2013?
You have to upgrade SP2007 to SP2010 first then.

Here is my findings so far:

 1. In SharePoint Server 2013, the In-place Upgrade approach is now unavailable for upgrading from prior versions of SharePoint products.

 But instead, you will get a set of "yummies" like:

• Deferred Site Collection Upgrade
• Site Collection Health Checks
• Evaluation Site Collections

SharePoint Server 2013 focuses on improving your upgrade options while providing support for the upgrade approach designed to be the most resilient: the Database Attach approach.

 2. SP2010 farm solution will run on SP2013.

But in case you want them make better, read on:
Upgrading a custom application to SharePoint 2013

 3. You can upgrade site collection by site collection:

Get-SPSite -ContentDatabase WSS_Content -Limit All | Upgrade-SPSite –VersionUpgrade

 4. A content database upgraded to SharePoint 2013 is capable of supporting both backward compatible SharePoint 2010 and SharePoint 2013 mode site collections

More on this:

Introduction to Upgrade in SharePoint Server 2013

Want to get a deep understanding of the Upgrade?

 - MS modules on Upgrading to SharePoint 2013

A good slide from one of the modules above on "how to proceed with upgrade to SP2013":

Craving for complication? and you want to deploy your farm solution in 14 and 15 mode?:

Read this:

Planning Deployment of Farm Solutions for SharePoint 2013