I’m using MS Outlook from past 8 years in Home as well as Office. Every time I faced the different issue, I don’t understand why Microsoft is not fixing all these issues permanently. Yesterday, my PST file got corrupted. I can’t send and receive any mail. I’m getting frustrated with this issue. My work is suffering because of this issue. I searched this problem over Google and found that PST file got corrupt because of abnormal activities of Outlook. But I can’t perform any abnormal activity. I have found a few solutions to this problem: 1. Inbox Repair Tool 2. ScanPST.exe While using the inbuilt tool “Inbox Repair Tool” it gives an error. My time is wasted because of this tool. After that, I tried another tool SCANPST.exe. It also fails because my PST file size is too large around 19.8 GB. I have tried all methods to fix this error but nothing happened. Please provide the best solution. I have found over this forum and found one thread. https://forums.overclockers.co.uk/threads/outlook-2016-not-sending-emails.18703626/#post-28846436 I have tried these methods which you have mentioned in this thread. But no one works for my problem. I searched this problem over the Internet and found few references. https://support.office.com/en-us/ar...-and-ost-25663bc3-11ec-4412-86c4-60458afc5253 https://support.microsoft.com/en-us/help/272227/how-to-repair-your-outlook-personal-folder-file-pst https://www.stellarinfo.com/outlook-pst-file-recovery.php https://social.technet.microsoft.co...-pst-files-fatal-error-80040818?forum=outlook http://www.fixoutlookpst.fixoutlookerrors.com/fix-outlook-0x80004001-implemented-error/ Please check these references and suggest me the best solution. I’m a little bit confused which one suit for my problem.