Using Classic Outlook on Windows for personal email, calendar, and contact management
Hi, D46-Gregnier
Good day!
Thank you for posting to Microsoft Community. We are happy to help you.
According to your description, the issue of your concern that your users' Outlook calendar are missing availability.
First of all, thanks for your checking through the Safe Mode. Since it is working well under the safe mode, we believe there's something wrong on the Outlook desktop client.
Thus, please be kindly to try following methods and see if it can make any differences:
Check by repair your Office:
- Right-click the Start button
(lower-left corner), and select Apps and Features on the pop-up menu. - Select the Microsoft Office product you want to repair, and select Modify. **Note:**This will repair the entire Office suite even if it's just one application you want to repair such as Word or Excel. If you have a standalone app installed, then search for that application by name.
- Depending on if your copy of Office is Click-to-run or MSI-based install, you'll see the following options to proceed with the repair. Follow the steps for your installation type.
Click-to-run
In the window How would you like to repair your Office Programs, select Online Repair > Repair to make sure everything gets fixed. (The faster Quick Repair option is also available, but it only detects and then replaces corrupted files.)
MSI-based
In Change your installation, select Repair and then click Continue. 4. Follow the instructions on the screen to complete the repair.
Further as we can also create Outlook profile from control panel, so here sharing steps for the same, if needed, you can also try with it.
- Select the Windows icon, type Control Panel in the search box and select it.
- In Control Panel, search Mail, and select it.
- The Mail icon won't appear unless you have Outlook installed and have run the program at least once. The Mail Setup dialog box opens.
- Click Show Profiles .
- Click Add .
- Type a name for the profile, and then click OK .
- Add an e-mail account to use in your profile by following the directions on your screen and set up account.
If still same query, please be kindly to download Microsoft Official tool -Microsoft Support and Recovery Assistant and it will scan your Outlook and analyze it automatically.
Thanks for your patience and cooperation from the above attempts. this will help us to better locating the issue for you.
We're glad to assist you and please feel free to contact us if you need further assistance.
Have a nice day,
Sincerely,
De Paul | Microsoft Community Moderator