Some developers in the office have created an application that accesses an Exchange 2010 email account. It has happened on a couple of occasions that they are unable to connect to the account only to wait, and without any changes in the Exchange or AD back end, it works again shortly thereafter. The issues have unfortunately happened while I was unavailable to immediately assist so I couldn't see if the AD account was locked but we are wondering if there is a limit to how often Exchange allows an account to be accessed from an application. I apologize on the lack of details regarding the application, the frequency of connections, the manner of connection, etc. but I wanted to post this question and come back with more details as I receive them. For now I'm just wondering if this is an Exchange setting that is halting connectivity or if it's poor coding (the devs words) that is causing the issue.