Zacal bych zde
http://support.microsoft.com/kb/2652320
a take
https://support.office.com/en-us/article/Outlook-not-responding-stopped-working-freezes-or-hangs-5c313d04-64af-4441-82d2-44e5a43eee5a
Nekdy jsou priciny problemu uplne jinde
http://www.slipstick.com/outlook/2013/outlook-2013-hangs-due-hardware-acceleration/
M.