• Overview
  • Features
  • Resources

Migrate content to SharePoint 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, SharePoint 2013 and SharePoint 2016.

Start My Free Trial
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 and Opera)
Extract email metadata
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
Complements standard SharePoint 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 versions in SharePoint
Scalable✓ (can be used my multiple users at the same time)

Simple and fast migrations to SharePoint

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.
Try it now

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. The tool consists of a small file (1 MB) that needs to be uploaded to SharePoint. Access to the tool can be easily implemented by using standard permissions in SharePoint.

To start the tool simply open the file in SharePoint. Migration Manager displays the SharePoint environment by mimicking Windows Explorer in a browser. This provides the users with a familiar interface and it does not have the problems associated with using explorer view.

Migrating content to SharePoint 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 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 SharePoint “Document” Content Type and the SharePoint “Folder” Content Type respectively. Migration Manager allows the user to select different Content Types and also to provide 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
Sometimes content needs to be uploaded without folders. Migration Manager supports this by skipping the folder structures and by making each document name unique to avoid overwriting documents with the same name. To skip folders select the option “Skip folders and flatten folder structure” for folders.

Common upload problems
SharePoint imposes 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 versions and applies fixes for that specific SharePoint version. For example, SharePoint 2013 blocks quite some 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.

Email metadata
Migration Manager is able to extract email metadata like To, From, Subject, Conversation, … from msg files. The values can be captured into SharePoint columns for use in views and to perform powerful searches. The mapping between email metadata and SharePoint 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)
Migration Manager facilitates migration of content to SharePoint and viewing content. Documents stored in SharePoint often needs 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 column to keep the original value. For instance this allows content migrations of legacy content into SharePoint without creating content with a new modification date. Creating the items with the original modification date is very valuable for viewing and sorting content and also for disposing content when it 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 10 GB for SharePoint 2016. For SharePoint 2013 the maximum file sizes are browser dependent (see release notes). 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 tool also allows the user to delete major and minor versions whilst keeping a fixed number. For example, delete all major versions apart from the most recent 3 major 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 does provide this functionality even for the classic view by allowing users to download multiple documents and/or folders into a single zip file.


Supported configurations


Migration Manager supports the latest versions of Chrome, Opera and FireFox plus Internet Explorer 11 and Edge.
Note: uploading folders is only supported on Chrome, Opera and Edge. Support for FireFox will be available in the next release.

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

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



Email metadata can be extracted from msg files. Support for emails in eml format will be available in the next release.

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