Now you would wonder why it is showing Exchange 2013 OAB name. This is one of the OMG situation because you saw the warning that you can’t install Exchange 2013 any more while updating active directory and Exchange 2013 is there.Something wrong with Schema update or did you mess up the infrastructure.For web-based distribution make sure the site is up.Exchange 2013/2016 Exchange 2013/2016 will only be distributing the OAB via web-distribution. For all versions of Outlook (since 2003) you have two choices, either take Outlook out of cached mode* (so it queries the ‘live’ global address list).This situation however is extremely rare since the default maintenance time on Exchange is at AM and updates and downloads are usually performed during working hours.Even though Outlook is the last in the chain, it is often the first level where the troubleshooting takes place as usually this is where the request is coming from.Microsoft is conducting an online survey to understand your opinion of the Technet Web site.
24/02/13 If you create a new user, give them a mailbox, and they seemingly fail to appear then don’t panic! If you receive an error message then you can investigate further (Note: Set your Outlook client to send you a delivery report on the test email as well). The easiest way to do this is simply connect to Outlook Web Access, and query the GAL directly (OWA uses the GAL no the OAB like Outlook running in cached mode does). The User/Mailbox IS listed on the Server But NOT in Outlook.CAS role accepts the OAB download request from clients and proxies to a Mailbox role server. As always, your best friend in troubleshooting is none other as “Test Email Auto Configuration” tool in Outlook.CAS maintains a log of each request it handles in the log files, present in %Exchange Install Path%\Logging\Http Proxy\OAB\. Take a look at the video @ 31.31 minute and understand the Outlook connection process and then jump to using Test email auto configuration with Outlook.Exchange 2013 only supports Outlook 2007 (post SP3 and cumulative update), and Outlook 2010 must be at SP1 with cumulative update. For public folder distribution ensure the public folder database is mounted, and at least one server holds a replica.Also in the properties of the mailbox database, your users are using, make sure it points to the correct public folder database.