Hi @IT ASSISTANT SWIFT AGENCIES ,
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What's the version of your Outlook? (File > Office Account > About Outlook). Please make sure you have upgraded your Outlook to the latest version.
And does this issue occur recently? If so, have you done any specific operations before that?
As i know, this issue might be caused by a variety of reasons, such as Internet connectivity issues, Outlook crashes, or corrupted files. Please refer to this article to troubleshooting:
Outlook not responding, stuck at "Processing," stopped working, or freezes
Hope the above help!
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