Assume that you use Microsoft Office 365 on a computer that's running Windows 8, Windows 8.1, Windows Server 2012, or Windows Server 2012 R2. When you use Microsoft Outlook to connect to Office 365 Exchange servers, Outlook displays a "Trying to Connect" or "Disconnected" status for a time period of five minutes to an hour or more.
This problem occurs because individual function calls in the remote procedure call (RPC) over the HTTP connection take a long time to return. Additionally, these calls pile up under heavy-load scenarios. This pile-up situation causes the call-return process to take even longer.
Hotfix informationA supported hotfix is available from Microsoft Support. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, go to the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
PrerequisitesFor Windows 8 and Windows Server 2012, there are no prerequisites to apply this hotfix.
For Windows 8.1 and Windows Server 2012 R2, you must first have update 2919355 installed.
Restart requirementYou must restart the computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace any previously released hotfix.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.