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title ms.reviewer ms.author author manager audience f1.keywords ms.topic ms.service localization_priority ms.collection ms.custom search.appverid ms.assetid description
Migrate file shares to SharePoint and OneDrive
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JoanneHendrickson
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article
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M365-collaboration
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Learn how to evaluate the environment, prepare, and migrate content from file shares to OneDrive and SharePoint in Microsoft 365.

File share to OneDrive and SharePoint migration guide

This guide will help you prepare to migrate from file shares to OneDrive and SharePoint in Microsoft 365.

Most migrations fall into regular phases as follows. Proven success factors for migration include planning, assessing and remediating, preparing your target environment, migrating, and onboarding your users.

Note

The SharePoint Migration Tool is a Microsoft-developed migration tool available at no cost. To download: SharePoint Migration Tool .

Migration process

Migration planning Assess and remediate Prepare your OneDrive and SharePoint environment Migrate User onboarding
What content goes where

Understanding permissions vs sharing

What to expect before and after

Migration and network performance considerations

Change management and communications
Assess key areas

Remediate issues
Pre-provision Microsoft 365 and users Review migration offerings

Microsoft FastTrack services

Migration service providers
Send regular emails to users

Provide training

Let users know how they are impacted

File shares

File shares include centralized file hosting on a network server or a network drive or shared files or disks on a local computer. Often referred to as a "Z drive" on networked computers, it is a shared drive somewhere on the network.

Migration planning

Before beginning your migration, it is important that you plan your outcome by performing an assessment of your current source environment. What you discover will influence your overall strategy and timing, including:

  • The design of the target environment and the mapping between source and target systems.
  • The amount of content you migrate. Determine if content is redundant, out of date, or still relevant.
  • Build your user onboarding into your upfront planning. Communicate early and often with your users about the migration and how it will impact them. Don't wait until the very end to start preparing them for the change.

What's migrated

When preparing for your file share migration, it is important to know what is being migrated when you use the SharePoint Migration Tool and what is not.

Migrated Not Migrated
Documents Conversion of embedded URLs in content
File and folder structure Windows hidden attributes on file and folder
User level file and folder permissions Explicit deny permissions
Files under 15 GB Inaccessible or corrupted documents
Site, document, and folder metadata Files or folders exceeding current SharePoint restrictions and limitations

What content goes where

In your planning include how this transition to Microsoft 365 will make for a more collaborative experience for your users.

Review how you use the content stored in your file shares today. Does the file belong to a single user, even though they may share it with others? If so, save it in your OneDrive. Your OneDrive is private by default, but you can share files with others, which is particularly useful if you aren't working as a team yet.

If you're working on a file or folder intended for team consumption and collaboration, move it to a shared library where team members have access by default. OneDrive gives you access to all your shared libraries in Microsoft Teams, SharePoint, or Outlook. When you need a new shared library for team files, you can create one right from OneDrive, add members, and start working together.

Sharing

Permissions vs Sharing

How you have shared your files will dictate how they appear in the Shared with Me view in OneDrive.

Files and folders that you have opened from a shared location

  • After migration, the final permission level is determined by a mapping of the most restrictive share or NTFS permission level.
  • A user's Shared with me folder in OneDrive won't be updated for source files shared with a group the user is a part of.
  • After migration, all advanced NTFS permissions are removed. For explicit deny permissions, this means the content is subject to parallel permissions or permission on the folder and parent level and may become accessible.
Windows file share permissions SharePoint item access SharePoint role
Full control Full control Full control
Modify Modify Contribute
Read and execute Read and execute Read
List folder contents List folder contents Read
Read Read Read
Write Write Contribute

Assess and remediate your content

Before beginning your migration, it is important that you perform an analysis of your current environment. Only you know your data and how and who uses it.

The SharePoint Migration Tool (SPMT) provides the ability to scan your files and provide assessment reports. To find any issues with your file before migration, turn on the setting Only perform scanning.

If you have multiple sources you wish to assess, consider using the bulk process by creating a .JSON or .CSV file.

Here are some of the more common issues that arise when preparing for migration:

Assess Remediate
File extensions Find all files in the Folders and Files report whose Path ends in one of the extensions defined here: Types of files that cannot be added to a list or library If the blocked file types are scripting files, they are blocked because scripting capabilities are turned off by default in OneDrive.

If you want to allow these file types, turn on scripting capabilities as described here: Allow or prevent custom script.

Make sure you understand why these files are blocked by default as described here: Security considerations of allowing custom script.
File and folder name characters Find all items in the Folders and Files report whose name contains any of the characters detailed here: Invalid file names and file types in OneDrive and SharePoint Work with your migration vendor to substitute these characters in all file and folder names.

Note: The # and % characters are supported but not enabled by default. Follow these steps to enable them: New support for # and % in SharePoint and OneDrive.
File and folder path length Find all items in the Folders and Files report whose Path exceeds the file path length described here: SharePoint limits Work with your migration vendor to reorganize your file and folder structure such that it does not exceed this limit. Splitting large drives that serve several scenarios into multiple smaller, more focused drives may help here.

Prepare your OneDrive environment

Before migrating your file share content, you must pre-provision your users in Microsoft 365. For guidance on pre-provisioning, see

Migrate

Migration process

Below is a typical migration process that follows Microsoft's best practices guidance.

  1. Select a small set of users for a pilot migration. The goal of the pilot is to validate the process, including performance, user communication, and to get a sample of user feedback.

  2. Perform the pilot migration. This should use an incremental migration method, in which migration happens in the background with no user impact, followed by a cutover event in which network file shares and local file shares are disabled and they are directed to use the SharePoint or OneDrive environment. This method is preferred as it reduces user impact.
  3. Understand the data from the pilot migration to determine the remainder of your migration schedule and make any changes. For example, you may update your user communication template to address a question you received from a pilot user.

  4. Perform the remainder of the migration. This should also follow an incremental migration method, just like the pilot. Microsoft recommends a single cutover event for all users to switch to using their OneDrive accounts and SharePoint sites. This helps eliminate users from updating duplicate copies of content.

Migration offerings

Currently, there are a variety of migration offerings available to you. Which one is right for you?

Customer Self service FastTrack driven Partner driven
No cost for Microsoft provided tool
SharePoint Migration Tool
No cost; included in your Microsoft 365 subscription Price dependent on complexity
Process flexible, you set the pace Highly structured process and schedule Customized to your need
No need to configure complex infrastructure Must set up infrastructure including external access rights, VPNs, test environment, admin environment, establish framework of contacts Customized to your need
Less time required involved in scheduling process and restrictions Scheduling templates and questionnaires provided as part of the organization process Customized to your need
Customer controls the pace based on their needs Schedule is driven in partnership with the FastTrack team Customized to your need
May have to hire in expertise if you don't have it in place already Expertise provided by FastTrack Expertise provided
Customer controls the schedule flexibility; off hours and blackout hours are defined by them Must hold to a set schedule Customized to your need

Self service

The benefit for self-service migration is that you have full control over your process and timing, and you determine the pace of migration. We provide the SharePoint Migration Tool free of charge, and you will be able to leverage your own IT resources rather than having to invest in outside expertise.

Microsoft FastTrack

FastTrack is a Microsoft service included in your subscription cost providing you with a set of best practices, tools, resources, and experts committed to making your experience with the Microsoft cloud a great one. OneDrive onboarding guidance, migration benefits, and adoption guidance are included in the benefit offering.

Onboarding guidance includes: help to discover what's possible, creating a plan for success, and onboarding new users and capabilities at a flexible pace. The Data Migration benefit covers guidance on migrating content from file share, Box, or Google Drive source environments.

This guidance covers enablement of both OneDrive and the source environment. FastTrack will also perform specific data migration activities on behalf of the customer for those with 500 or more licenses. For more details, see FastTrack Center Benefit Overview. Interested in getting started? Visit FastTrack.microsoft.com, review resources, and submit a Request for Assistance.

Migration service providers

You may decide that your organization has specific business needs that require you to use third-party services or apps to help you execute your migration. Explore the professional services and applications available from partners in the Microsoft Partner Center. There you can find experts to help you in your enterprise content migration to Microsoft 365. For more info, see Microsoft Partner Center.

User Onboarding

Develop a plan to prepare your users for the upcoming change. Consideration factors to include in your plan:

  • Evangelize the move. Underscore the benefits, the collaborative capabilities, and the reasons for making the move.
  • End user training. Provide training to your users on the features in OneDrive.
  • Train your helpdesk. Before the cutover, train your helpdesk in key features and common user questions.
  • Prepare for any possible downtime the migration may incur.

Develop a plan for sending communications to your user base, providing clear statements of timing, and expectations and impact to the individual, including:

  • The migration timeline and how it will impact them. Include any user calls to action.
  • Assure them that if they have content already in OneDrive, that their content is safe and won't be overwritten.
  • Let them know whether individuals can opt out of the migration process.

Onboarding related resources