We started migration at this site and have multiple sites throughout the US. We have Exchange 5.5 and Installed Exchange 2007 and Active Directory. We have noticed that the meeting request function in Outlook 2002 is erratic from Exchange 5.5 to Exchange 2007 users. Some get the meeting requests correctly and others as a plain text email. I send to three 2007 users and one will get it correctly. Another user sends the same request to the same three people and 2 will get the correct request and another plain text. I can login to another computer and get totally different results. Has anyone seen this problem before? We stopped this migration until this can be resolved.