Infopath - BizTalk integration form changes advice

[matsla]

Hi all,

I need some advice how to handle infopath form changes with BizTalk
integration

We publish all infopath templates to sharepoint document library. Data
in each InfoPath form is stored in a database. If we need to update the
infopath form we also need to update BizTalk. Now if BizTalk is updated
with the changes what will happen with old versions of the infopath
forms when users try to open this form.

I need som advice how to manage InfoPath updates and BizTalk changes

Thanks in advance

// Mats