If you try to connect Outlook 2007 or 2010 on Windows XP to Exchange Server 2013, you will face an issue of continuous password prompt for an account.
This issue is about some special kind of work with certificates in Windows XP.
Imagine that you have array of strings (email addresses for example):
one-domain.rutwo-domain.ruthree-domain.comfour-domain.comfive-domain-company.com
You have a task - find email addresses in domain domain.ru among these strings.