• Overview
  • Features
  • Resources

Migrate content to SharePoint / OneDrive for Business using a browser

SLIM Companion Migration Manager is a browser-based migration tool with unique capabilities. It is easy to use, easy to deploy, cost-effective and fast.

The tool mimics Windows Explorer in a browser and allows users to upload multiple files or complete folder structures from the user’s computer, file shares, OneDrive, Google Drive, DropBox, Box and SharePoint 2007/2010/2013/2016/Office 365 by using drag and drop.

Migration Manager uses parallel processes for uploading content, supports custom metadata and automatically extracts email metadata from emails.

The tool is compatible with SharePoint Online (Office 365), Office 365 Groups, OneDrive for Business, SharePoint 2013 and SharePoint 2016.

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Slim companion tool helped my migration work of 100+gb local data to Sharepoint online.
the most beautiful thing about the tool is its super fast & efficient !
just loved it, I would recommend this for bulk uploaders.

Migrations in 3 steps

Select content

Simply drag and drop content from your source (e.g. file share) into the Migration Manager tree.

Upload content

Use the default Content Types (e.g. "Document" or "Folder") or select custom Content Types, set metadata (optional) and start the upload.

Assess upload

View the migration log and check for warnings.

Migration Manager Features

Check out this figure with key features

Feature overview

FeatureMigration Manager
Easy to use
Support for custom metadata and Content Types
Upload documents and folders using drag and drop✓ (Chrome, Edge, FireFox and Opera)
Extract email metadata (msg and eml)
Cater for illegal characters, blocked files and long URLs
High throughput✓ (Up to 18 GB per hr per browser)
Suitable for large data sets✓ (10's of GB's)
Supports very large files✓ (up to 15 GB file sizes)
Easy to deploy
Resilience for network / server glitches
Download documents / folders✓ (10's of GB's)
Keeps standard SharePoint / OneDrive for Business functionality (e.g. open Word file in Word Online)
Flatten folder structures
Preview emails (and directly open email attachments)
Keep original modification date
Reporting on SharePoint content
Delete major/minor document versions
Scalable✓ (can be used my multiple users at the same time)

Simple and fast migrations to SharePoint / OneDrive for Business

SLIM Companion Migration Manager transforms your browser into a powerful migration tool supporting large data volumes, multiple sources, very large files and custom metadata. This innovative tool is easy to use, easy to deploy, cost effective and fast. Last and not least, the tool is highly scalable because it can be used by multiple users at the same time.
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Getting started

SLIM Companion Migration Manager transforms your browser into a powerful migration tool. It enables users to upload content from a variety of sources (e.g. file shares, SharePoint 2013, …) to SharePoint using drag and drop. It supports custom metadata (and Content Types), extracts email metadata, supports large document volumes and is fast.

The tool does not require any installs on the user’s computer or on SharePoint / OneDrive for Business. The tool consists of a small file (1 MB) that needs to be uploaded to SharePoint / OneDrive for Business. Access to the tool can be easily restricted by using permissions.

To start the tool simply open the file in SharePoint / OneDrive for Business. Migration Manager displays the content by mimicking Windows Explorer in a browser. This provides the users with a familiar interface. Moreover, it avoids the problems commonly observed with using the explorer view (e.g. only available on Internet Explorer, authentication problems, …).

Migrating content to SharePoint / OneDrive for Business is simple. Open the source (e.g. file share) in Windows Explorer and drag the content into the required location in the tree. Note that only Chrome, Opera, FireFox and Edge support dragging folders.

Migration Manager in-depth

Migration Manager first creates an inventory of the selected content. By default all content is marked for uploading. You can exclude folders (and it’s contents) by unselecting the checkbox(es).

By default documents and folders are uploaded using the “Document” Content Type and the “Folder” Content Type respectively. Migration Manager allows the user to select different Content Types and also to set values for metadata fields used in these custom Content Types.

Migration Manager supports commonly used metadata types like single line of text, choice, dates, … but also managed metadata.

Upon clicking “Proceed” a check is done if there are required fields in the Content Types that do not have a value. If so, they are marked in red and the user is informed to provide a default value. If the checks are all successful the uploading starts. The progress for each item is shown. Item names are greyed out when they have been uploaded successfully.

When all items have been uploaded the upload statistics table is shown.

The migration log provides filters to only list items meeting a specific criteria (e.g. failed)

Skipping folders
Some organisations want to stop using folders and use metadata to organise content. Migration Manager allows uploading of documents in nested folders structures without creating the folder structure. The original path details can be captured into SharePoint / OneDrive for Business columns for use in views. The tool also ensures document names are made unique to avoid overwriting documents with the same name. To skip folders select the option “Skip folders and flatten folder structure” for folders in the metadata popup window.

Common upload problems
SharePoint and OneDrive for Business impose restrictions on the characters used in item names, document sizes, document types, uploading items with too long names, long URLs, etc… Migration Manager automatically caters for this. The tool detects the SharePoint or OneDrive for Business version and applies fixes for that specific version. For example, SharePoint 2013 blocks several file name extensions (e.g. exe and bat). These blocked files are automatically placed into a zip file during uploading. This way the original file is uploaded to SharePoint or OneDrive for Business.

Email metadata
Migration Manager is able to extract email metadata like To, From, Subject, Conversation, … from msg and eml files. The values can be captured into SharePoint or OneDrive for Business columns for use in views and to perform powerful searches. The mapping between email metadata and columns is managed centrally but individual users can set their own mapping (via Settings menu).

Previewing emails
By hovering over an email icon in the Migration Manager tree a preview of the email is shown in the right hand pane. The presentation of the email is similar to the presentation used in Outlook and the attachments are shown as hyperlinks. The attachments can simply be opened without downloading the email and then opening the email in the local mail client. This increases productivity for users and enables users to open msg emails (and their attachments) when they do not have Outlook installed (e.g. macOS users or users with a tablet).

Mail item(s)
Documents stored in SharePoint / OneDrive for Business often need to be shared with others through email. This typically involves downloading a document, opening a new email and attaching the document. The steps become progressively more cumbersome when dealing with multiple documents. Migration Manager simplifies this. Select one or more documents and click the button “Mail Attachment(s)”. This generates a new email message with the selected documents attached.

Mapping source properties
Migration Manager supports the following source properties:
– modification date
– path
– name
These properties can be mapped to a SharePoint / OneDrive for Business column to keep the original value. For instance this allows content migrations of legacy content without creating content with a new modification date. Keeping items with the original modification date is very valuable for viewing and sorting content. It may also help identify content which is no longer required.

Some technical characteristics
Migration manager supports migration of large document volumes (10’s of GB’s). Larger data sets can be easily split into smaller parts by excluding folders. The maximum file size supported is 15 GB on SharePoint Online (and OneDrive for Business) and 10 GB for SharePoint 2016. For SharePoint 2013 the maximum file sizes are browser dependent (see release notes at the bottom of the page). Unlike many migration tools there is no limit in terms of the data volume uploaded or downloaded.

The tool allows users to create a basic inventory of the content of a document library. For example, list the number of documents, the number of folders, content types used, number of major versions, diskspace consumed by document versions, … The inventory of documents and folders can be exported as a CSV file.
Major and minor document versions can be deleted in a controlled way. For example, delete all major document versions apart from the 3 most recent versions.

Downloading content
Recently the standard SharePoint modern view has been extended to allow downloading of folders. This functionality is not available when using the classic view or SharePoint 2013. Migration Manager allows downloading of multiple documents and/or folders into a zip file. Very large document volumes are supported (e.g. 10’s of GB’s) by using multiple zip files.

5000 List View Threshold (Large Lists)
The 5000 List View Threshold precents access to content unless special measures (e.g. views using indexed columns) are used. Migration Manager caters for Document (and Picture and Asset) libraries that exceed this limit. The content is retrieved in chunks and does not require any changes to SharePoint or OneDrive for Business. Using Migration Manager it is possible to browse through large lists, Download & Zip it’s contents and report on the list’s content.

Supported configurations

Migration Manager supports migrations to SharePoint 2013, SharePoint 2016, OneDrive for Business and SharePoint Online (Office 365, including Office groups).



The tool can be used with Document Libraries, Picture Libraries and Asset Libraries. The latest versions of Chrome, Opera and FireFox plus Internet Explorer 11 and Edge are supported (on Windows clients and Mac OS). Note: uploading folders is not supported on Internet Explorer 11.

Supported browsers

The supported sources are the user’s computer, file shares, OneDrive, Google Drive, DropBox, Box and SharePoint 2007/2010/2013/2016/Office 365 and OneDrive for Business.
Note: the source system needs to be accessible through Windows Explorer or Finder.

Additional information

For further information check out the following sources:

Or contact us directly (here).

To summarize, Migration Manager transforms your browser into a powerful SharePoint migration tool that is simple to use.

This tool saved my life moving 750GB of local data to my customer’s Sharepoint environment. Good overview of uploaded files & folders and very fast tool to work with. Manual uploading should take several days, regarding the Sharepoint upload status bar.
Voskan Martirosian