- Do the emails arrive at the same time or day or in a week ?
- To count for 7 emails ... Is the maximum always 7 . And when do we have to stop counting the mails.
- I would probably try something with a getsetting and savesetting thing with the keywords :
1. emailadress
2. subjectline
3. emailno

3. holds the no of emails that comes in with the same settings.

(Or an excel file with every row a different mail... If column a - address, column b - subject, are the same as the new mail, column c is +1 ... and we skip this until column a is blank. If blank, new line for a new mail to check ...)

- Check with getsettings if the settings exists on every new mail starting from the time that the macro is implemented by using a rule.
- add 1 to emailno-keyword if it's not 6
- if email-no keyword = 6 then every mail in inbox that has the same adress and subject send to certain folder and create a new message to the adress of last email

This is only a rough sketch of my thoughts. Most likely it needs some finetuning before you could use this.

- You will probably also need a utility to bypass the security warning that outlook will give when you want to process the mails and send a new mail.