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Software is any set of instructions that directs a computer to perform specific tasks or operations. Computer software consists of programs, libraries and related non-executable data (such as documentation). Computer software is non-tangible, contrasted with computer hardware, which is the physical component of computers. Software written in a machine language is known as "machine code". However, in practice, software is usually written in high-level programming languages than machine language. High-level languages are translated into machine language using a compiler or interpreter or a combination of the two.
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I've had a similar problem with Symantec Antivirus stopping me from deleting messages in the above scenario.
Only way I could delete the mail was to stop the Symantec Antivirus Service on the local machine, close down the AV client. Launch Outlook and then delete the mail.
Just remember to activate the AV software again.