The optional September Update Rollup for Windows 8.1, Windows 8.1 RT and Windows Server 2012 R2 brought 23 documented fixes and one of them is for the following Outlook scenario:
- When folder redirection is used for saving attachments to a specific folder, opening an attachment could take a long time when the network connection latency is high.
For example, it may take more than 30 seconds to open a small TXT file.
As this fix is included in an optional update, it won’t be installed automatically. To install it, you must open Windows Update from Control Panel and click on the link about available optional updates. Select the update and click on the “Install updates” button.
View: KB2989677: It takes a long time to open an attachment in Microsoft Outlook in Windows 8.1 or Windows Server 2012 R2