Exchange has known the concept of internal and external URLs for the different services (Outlook Web Access, OAB, EWS, ActiveSync etc) since Exchange 2007. And it’s still confusing people. The internal URL is the URL, that is used to access the desired service from the intranet. The external URL represents the URL that is used to access the service from the internet. Best practice is to use the same URL (the external) for both, use a certificate from a public CA, and use split DNS to access the external domain from the inside of your network.
The recovery of an Exchange mailbox using a recovery database is usually no big deal. Simply restore the database, create a recovery database and recover the mailbox or items from the mailbox. Sometimes you have the luck that the customer has licensed the Data Protector Exchange 2010 Granular Recovery for Exchange (GRE). This was unfortunately not true in my case. Okay, so let’s do it the old way. The needed tape was available in the library and luckily it was a full backup. So I quickly added a disk to the VM and started the recovery of the database to a temporary location. At this point, the disaster took its course…
When moving users to Exchange 2013 it can happen, that they can’t access public folders housed on the old Exchange 2010 or 2007 server. The same can happen to shared mailboxes (mailboxes with Full Access permissions). The users are constantly prompted for credentials or they get this message:
Cannot expand the folder. Microsoft Exchange is not available. Either there are network problems or the Exchange server is down for maintenance.
This can be a huge problem during a migration. Microsoft described this in KB2834139. This error is caused by a misconfigured Outlook security setting, called “Logon network security”. If you experience this issue, check the “Logon network security” setting. If it’s set to “Anonymous Authentication”, then you experience the in KB2834139 described problem. Otherwise you have another problem. Check the “Logon network security” settings in your Outlook client. I took this screenshots from a Outlook 2013, but it looks the same in Outlook 2010. With this setting you will have a problem: