Download 64-bit Version of Microsoft Online Directory Synchronization ((DirSync)) Tool for Office 365

The 64-bit version of the Microsoft Directory Synchronization Tool (DirSync) is now available and is identical to the 32-bit version. The 64-bit DirSync tool uses Forefront Identity Manager (FIM) 2010 as the underlying synchronization engine. "Even when the 32-bit instance of DirSync is removed, the overall state of the objects in your on-premises and cloud […]

Microsoft Online Directory Synchronization Tool for Office 365The 64-bit version of the Microsoft Directory Synchronization Tool (DirSync) is now available and is identical to the 32-bit version. The 64-bit DirSync tool uses Forefront Identity Manager (FIM) 2010 as the underlying synchronization engine. "Even when the 32-bit instance of DirSync is removed, the overall state of the objects in your on-premises and cloud directories is preserved. When you install and configure your 64-bit instance of DirSync, it will find and match objects in the cloud with on-premises objects," Microsoft stated.

"However, the 64-bit instance will not find and match objects in the cloud if on-premises object deletions occurred when the 32-bit instance of the directory synchronization tool was offline. Therefore, it is important to minimize changes to on-premises objects during the upgrade."

Microsoft notes that the 64-bit DirSync tool will not provide full multi-forest AD support. We will be releasing a DirSync tool that will support Multi-forest AD in the future; more details will be published closer to that time.

To download the 64-bit version of the directory synchronization tool from the Office 365 portal:

  1. In the header, click Admin.
  2. On the Admin page, in the left pane, click Users.
  3. At the top of the Users page, click the link next to Active Directory synchronization.
  4. Under step 4, select Windows 64-bit version, and then click Download.

For instructions on how to install both the 32-bit and 64-bit versions of DirSync, visit this page.