http://jetlounge.net/blogs/teched/archive/2009/10/09/string-building-and-advanced-expressions-in-sharepoint-workflows-yes.aspxYES! It is possible: http://blog.summitcloud.com/2009/10/advanced-string-functions-in-sharepoint-workflows-yes-we-can/enCommunityServer 2007.1 (Build: 20917.1142)