Hello everyone, My MS Outlook 365 MSO 64 bits, changed the attached files names for all attachment types automatically to my new emails sent, and to my historical emails. Actually, it replaced the last letter of the file type with an underscore (“_”); (i.e. “.docx” to “.doc_” or “.pdf” to “.pd_”). I did check my Kaspersky configuration related to this matter, and this is what I had by default: Settings->Protection->Mail Anti-Virus->Advanced Settings/Protection Scope_incoming and Outgoing messages (checked) / Connectivity_Scan POP3, SMTP,NNTP, and IMAP traffic (checked) _Connect Microsoft Outlook Extension (checked) / Heuristic analysis_Medium scan / Scan of compound files_scan attached files of Microsoft Office formats (checked) / Scan attached archives (checked) / Attachment filter_Rename attachments of selected types I understand Kaspersky found something up and did the change? If so, how can I resolve the problem? I did not get any message about it. Can I reverse the changes in my historical messages? Thank you in advance for you help on the matter…