Do you have AVG (or any other Anti Virus) installed?
If so try disabling it first. AVG scans all messages everytime you open it and can cause Outlook to hang if you loads of messages especially with attachments.
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D&AD Awards 2017: see the best design, advertising, illustration, animation and VR of the past year
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.