Hell yes you do if it doesn't comply with the audit, security and distribution requirements of the organisation.
Outlook effectively shoots all of the above without massive customisation which is expensive, ineffective and has so many edge cases it's unreal.
People hate IT people because they don't like being told what to do and don't like learning how to do stuff which is outside their comfort (read incompetence) zone. When it comes to handling your company's data, doing what you are told to do and following the process is the law.
Outlook effectively shoots all of the above without massive customisation which is expensive, ineffective and has so many edge cases it's unreal.
People hate IT people because they don't like being told what to do and don't like learning how to do stuff which is outside their comfort (read incompetence) zone. When it comes to handling your company's data, doing what you are told to do and following the process is the law.