升級至Exchange 2016和outlook 2010連線很慢，另外Web介面的Exchange 系統管理中心反應也很慢.Outlook slow after migrating to Exchange 2016..

Outlook slow after migrating to Exchange 2016

由exchange 2010升級至 exchange 2016後

• 發現用outlook 2010 online mode連上exchange 2016超級慢，cache mode有好一點，但也是慢。
• 另外使用Web介面的Exchange 系統管理中心也是後慢，硬體是新的，Ram很大，如此的表現真的很怪...
• 我用google大神匯總了熱心人士PO文的幫忙下，終於...慢的問題似乎解決了，3大方向如下：
• 因為exchange server放在VMware上，所以網路設定需要tuning，可調vmware或PC端，我是調整PC端regedit ｢TcpAckFrequency｣，如果沒調它outlook attach file or reply large email會很慢。
• exchange 2016是使用最新的MAPI over HTTP protocol，但它似乎和outlook 2010不太合，所以我disable MAPI over HTTP，讓outlook 2010使用原有的RPC/HTTP方式連線，如果沒調它outlook反應很慢或是沒有回應。
  參考資料：Outlook Slow and Unresponsive with MAPI over HTTP to Exchange 2016
• Disable Exchange server IPv6，如果沒調它exchange web管理介面反應很慢

以下是解決的方式，分別設定Client PC及Exchange Server
Client：
在執行outlook的電腦改一下regedit

參考資料：http://support.microsoft.com/kb/2020559/en-us

1. Start Registry Editor (Regedit.exe).
2. Locate and then click the following registry subkey:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces
   the interfaces will be listed underneath by automatically generated GUIDs like {064A622F-850B-4C97-96B3-0F0E99162E56}
3. Click each of the interface GUIDs and perform the following steps:
   a.  On the Edit menu, point to New, and then click DWORD value.
   b.  Name the new value TcpAckFrequency, and assign it a value of 1.
4. Expand HKEY_CURRENT_USER > Software > Microsoft > Exchange.
5. Right-click Exchange, and then click New > DWORD. 
6. A new DWORD entry appears in the right pane.
7. Right-click the new DWORD entry, and then click Rename.
8. Type MapiHttpDisabled.
9. Right-click the MapiHttpDisabled entry, and then click Modify. 
10. The Edit DWORD Value dialog box appears.
11. In the Value box, type 00000001, and then click OK.
12. Exit the Registry Editor.
13. Restart Windows for this change to take effect.

Exchange server上要將IPv6 disable

To configure IPv6, modify the following registry value based on the following table.

Location:         HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\

Name:             DisabledComponents

Type:             REG_DWORD

Value:        0xFF (IPv6 disabled)

注意：IPv6的值一定要是0xff 如果是0xfffffff表示是錯的，將它設定成0xff

應不用重開server，如果不放心，重開也OK，但再進到Regedit Check一下值對不對。

參考資料：

Outlook Slow and Unresponsive with MAPI over HTTP to Exchange 2016
https://interactivewebs.com/index.php/general-tips/outlook-slow-and-unresponsive-wiht-mapi-over-http-to-exchange-2016/

Outlook slow connectivity after Exchange 2010-2013 migration

https://social.technet.microsoft.com/Forums/en-US/833c16c9-0067-489e-91e0-de1a661af9a3/outlook-slow-connectivity-after-exchange-20102013-migration?forum=exchangesvradmin

Guidance for configuring IPv6 in Windows for advanced users

https://support.microsoft.com/en-us/help/929852/guidance-for-configuring-ipv6-in-windows-for-advanced-users

slow online mode "browsing"

https://social.technet.microsoft.com/Forums/office/en-US/0d45b1b0-3047-4666-ad04-217e98ed8823/slow-online-mode-quotbrowsingquot?forum=exchangesvrclients