1、查看mapi/http的虚拟目录配置情况
Get-MapiVirtualDirectory | fl auth
在iis中回收MSExchangeAutodiscoverAppPool
2、修改注册表
[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Outlook\AutoDiscover]
“ExcludeHttpsRootDomain”=dword:00000001
“ExcludeHttpsAutoDiscoverDomain”=dword:00000001
参考链接:https://www.systoolsgroup.com/updates/outlook-takes-long-time-to-connect-exchange-server/