Most times, this is caused by a corrupted search index, which you can rebuild. Keep in mind this does take a while, and it’s usually best done after the user has left for the day. Sometimes you’ll open Outlook and then for no apparent reason, it will freeze or shut itself down. There are quite a few different causes for this, but one of the most common is a defective add-in. Here’s how to disable add-ins in Outlook even when it keeps crashing.
When the Mapi32.dll file is damaged or corrupt, you may encounter the following send and receive error while sending or receiving messages in Microsoft Outlook. Poor network or internet connection can lead to Outlook send and receive errors as the client fails to communicate with the mail server. Thus, it’s important to ensure that your internet is working. If you find stuck messages, follow these steps to clear them and resolve the Outlook send and receive error. If you are not sure, disable the firewall temporarily to check if it’s the cause behind the Outlook send/receive error. After disabling, if you’re able to send/receive new messages, contact the admin or service provider for the information and make changes to the firewall settings.
Uninstalling this part of your virus scanner is strongly advised