To avoid this scenario, the user can log on by using a UPN instead of domain\username. After Outlook discovers the UPN for the user, the value is cached in the profile, and the lookup should not happen again for this user. In complex environments, this may cause a large number of DCs to be contacted before a result is found. Outlook will request that this lookup should chase referrals. In order to get the UPN, Outlook must first look the user up in the directory. But if a user use domain\username to log in Windows, Outlook only has the same credential for the user. The UPN may have been used to logon to Windows, in which case Outlook has direct access to the UPN from the logon credentials. On a domain-joined computer, Outlook needs to know the UPN for a user in order to initiate the Autodiscover process. Use User Principal Name (UPN) to expedite the Autodiscover process. For more information about MAPI, see the following MSDN article: Outlook MAPI Reference. When another application invokes it by using MAPI. In various scenarios, when a connection attempt fails, Outlook starts an Autodiscover task to retrieve new settings in any attempt to correct the connection problem. In response to certain connectivity failures. Each attempt can potentially be staggered by as much as 25 percent because of the background task infrastructure used by all Microsoft Office applications. If the attempt isn't successful, the next try is made 5 minutes later. If this process is successful, another try is made one hour later. Office 365 client update channel releases More information Autodiscover timingĪutodiscover runs at the following times:Īt set intervals to collect changes to URLs that provide Exchange Web Service features (OOF, Availability Service, and so on). Version and build numbers of update channel releases for Office 365 clients For more information about the Office 365 client channel releases, see the following Microsoft websites: This article describes the implementation of Autodiscover in the current channel Click-to-Run release of Outlook 2016. In Outlook 2016 with Exchange servers, Autodiscover is considered the single point of truth for configuration information and must be configured and working correctly for Outlook to be fully functional. Less SummaryĪutodiscover is the feature that Outlook uses to obtain configuration information for servers to which it connects. Outlook 2016 Outlook for Office 365 Outlook 2019 More.
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