![]() For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: ![]() The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix. This hotfix might receive additional testing. Apply this hotfix only to systems that are experiencing the problem described in this article. However, this hotfix is intended to correct only the problem that is described in this article. Resolution Hotfix informationĪ supported hotfix is available from Microsoft. ![]() This issue occurs because the NTLM API throttling limit (MaxConcurrentApi) is reached. Therefore, users cannot access their mailboxes, and Microsoft Outlook seems to stop responding. For example, Exchange clients do not authenticate to the Exchange server when this issue occurs. In this scenario, the NTLM requests time out. There are lots of NTLM logon requests from remote domain users to a resource server that is running Windows Server 2008 R2. There are combinations of users and resources (such as applications or proxy servers) in different domains. You have one or more forests that have multiple domains.
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