If you can't use the office controls in the OA system, you need to uninstall the installed office software, as follows:

1. Of course, the uninstall tool of office needs to be solved by itself. Baidu search "completely uninstall office tools" and download a spare one.

2. Each version of office has its own special uninstall tool, so don't use it wrong. Here, of course, take office2007 as an example. It works as follows: Check "I agree" and click "Next".

3. It will take a short time to make some preparations before unloading. Just wait.

After the preparatory work is finished, you can move on to the next step. Click "Next" button.

5. After uninstalling, a command line window will pop up, showing the uninstallation progress. Please wait patiently for it to finish.

6. The uninstaller of office will be called during the uninstallation process, so it can be completed automatically. After uninstalling, the program window will automatically close, so you can choose another version of office software.

This solves the problem that office controls cannot be used in OA system.