The Server Extension enables Sharegate to make just one call to get a file and all its versions at the same time. Without the extension, Sharegate must make one call per version. If for example you have 100 files to copy, and each those have 20 versions each:
- With the Server Extension: 100 calls are required.
- Without the Server Extension: 2000 calls are required.
- Download the Server Extension installer from here.
- Launch the Extension installer, and follow the path as specified.
Note: You must install the Server Extension on your SharePoint web front-end servers (including where your Central Administration is hosted, which is also a web front-end server). If you have more than one Web Front-End server, copy the installer into all of them, then follow the install procedure. Remember, your SharePoint server must have at least .NET framework 3.5 or higher in order to proceed with a Server Extension installation.
Installing the Server Extension will not cause any downtime on your SharePoint server and does not require a server reboot.
The Sandbox Server Extension has been deprecated, and will not be required when migrating to Office 365.