When determining infrastructure requirements for a client
often the question of whether to use BizTalk Standard or BizTalk
Enterprise comes up. If the client is a small enterprise with limited
redundancy and scaling needs the Standard Edition of BizTalk should
work fine. If the client requires any redundancy or scaling then
Enterprise is almost certainly necessary.
In other words if your requirements dictate that you require more than
one BizTalk server you will need the Enterprise Edition of BizTalk
since “BizTalk Server 2010 ENT is the only edition that supports using
more than one computer to share a BizTalk Server 2010 load.” As per the
BizTalk Pricing and Licensing FAQ athttp://www.microsoft.com/biztalk/en/us/pricing-licensing-faq.aspx