Outlook blocked access to the following potentially unsafe attachments

Dear Support,
I have an issue with attachment with Outlook. It is showing "Outlook blocked access to the following potentially unsafe attachments". I can't download,view the attachments with the mail.
The scenario is, I was on Outlook 2010 and upgraded to Outlook 2013 and the mails before a particular date has this attachment issue. I mean if I get mail today, there is no issues. I can download,view etc. I tried most of the registry entries like Level1,
etc but not solving at all. I have copied some emails from that to pst and tried on another PC, it was not working..
Please help me to fix this because the attachments are very important to us
Thanks

Hi,
Which type of email account are you using? Do you leave copies of your emails on the server? If so, we may first check if you can view or download the attachments from web access.
Does this issue happen to all types of email attachments received before a particular date? Please note that Outlook blocks some file types by default, you may check the list in the following link:
https://support.office.com/en-us/article/Blocked-attachments-in-Outlook-3811cddc-17c3-4279-a30c-060ba0207372
In addition, by "I tried most of the registry entries like Level1", do you mean that you tried adding the following registry but still not fix the issue?
HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Security
String Value: Level1Remove
Value: Type the file name extension of the file type that you want to open in Outlook. For example:
.exe.
If still no luck, we may also try other methods listed in the following article:
https://support.microsoft.com/kb/829982?wa=wsignin1.0
Please let me know the result.
Regards,
Steve Fan
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.

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