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.
Huawei P10 review
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.