You will need to check every Front End Server in the pool, as the user’s logs could have been updated to any one of them (the routing algorithm determines this based on load).
You can also check to the file store path using the Topology Builder: Select the site, and then select File Store. In Lync Server 2010 Enterprise Edition, prior to installation, the administrator creates a shared folder to contain both client and device update files.
A quota will help to ensure that the number of log files does not increase greater than the size of the file store, which could cause problems on the Web Services role.
The Device Update Web service log file store is installed as part of the Front End Server role, and we recommend that you set up the quota whether or not you are using the Device Update Web service.
An update file contains updates for one or more unified communications (UC) devices.
After obtaining the file, you upload it to Device Update Web service by using the Lync Server Management Shell.
Rolling back an update Roll back a defective update and retain a tested prior update as the latest update.
Inventory management for devices in organizations Use the log files and audit information stored in the Device Updates folder to view the IP phones in your organization and information about them, such as the current firmware version.
Microsoft makes updates available in cabinet (files) that you can download from the Microsoft Help and Support website.
If the device is turned on, but no user signs in, and no user has ever signed in on the device, then the device sends a DNS lookup request to ucupdates-r2., and obtains the internal URL of the server running the Device Update Web service.
The device checks for updates every time it is turned on, every time the user signs in, and every 24 hours, by default.
The administrator then specifies the location of this folder in the Create Front End Pool wizard during deployment.