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 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:
- In the header, click Admin.
- On the Admin page, in the left pane, click Users.
- At the top of the Users page, click the link next to Active Directory synchronization.
- 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.