Wow what an incredible couple years SharePoint 2013 is still rockin on premise and online
Time Consuming Steps
However, there were two time consuming steps that didn’t have anything to do with the mechanics of the migration or the technology like moving WebParts, Pages, Items, Documents and creating Site Collections from Sites in Additional Content DBs.
Luckily, there were two sources of information that made this easier but still not painless Waldeks Post – Building Global Navigation in SharePoint 2013 http://blog.mastykarz.nl/building-global-navigation-sharepoint-2013/ (it works) and the WAND Library. Unfortunately, though I have access to the Library the client did not choose to purchase the subscription so we didn’t get to take advantage of the huge library of terms.
WAND has started offering its entire catalog of taxonomies from the cloud, where you have the ability to subscribe monthly and download the parts that your Client needs to either start their taxonomy or fill out their taxonomy. I have just been through a relatively easy migration 8 Content Dbs and a small 1TB of Content.
Missing Tools for In-Flight Conversion of Site Columns
The largest notable part missing, though metalogix will help you modify Multi-Choice Site Columns to Managed Metadata Site Columns In-Flight, there are NOT ANY migration products that will convert your binary File Format documents to the OpenXML File Format.
The Microsoft tools like Office Migration Planner will not work with a mapped drive using WebDav, but you can still use PowerShell though we found it was actually better to use a staging Farm, Convert all of your Documents using Word Automation Service. then perform a final migration where we modify the columns In-Flight to take advantage of the managed Metadata Site Columns.
This is important, if you want to take advantage of changing the Multi-Choice Site Columns to managed Metadata Site Columns In-Flight. Because if you have not converted all of your RTFs, HTMs, DOCs to DOCX then you will lose the metadata associated with these documents.
I’m not sure why metavis, sharegate, metalogix, tsunami or others do not build document conversion into their products since we need to be moving off the Binary format for many reasons and embracing the OpenXML Format