The Microsoft Directory Synchronization has been available in a variety of versions and names:
- DirSync (the original).
- Azure Active Directory Sync (AADSync).
- Azure Active Directory Connect (AADConnect).
Each version of the tool had a number of releases, for the original DirSync for example there were 14 different releases as can be seen here. Similar information for AADSync (5 releases) can be found here, and for AADConnect (12 releases) you can find it here.
In my test environment (Exchange hybrid) I’m currently running AADSync 1.0.491.413. Since the current (as of March 2016) version is AADConnect 126.96.36.199 it’s time to upgrade J
When upgrading from a previous version there are two options:
- In-place upgrade – this is the recommended way if the upgrade time takes less than three hours.
- Parallel upgrade – This is the recommended way if the upgrade time takes more than three hours.
Why three hours? The Directory Synchronization runs every three hours. It is also estimated that if you have more than 50,000 objects to synchronize, the upgrade will take more than 3 hours.