If you make a field such as UserToEmail([Primary]), it will be an email address. Then make a Table report and do at least one Group By. For example even group on something that has only one selection, Include the email address field on your report. There will be a little blue envelop icon as a total at the bottom of the report. Click that and the email addresses will populate into your email client TO box such as Outlook. :)
Either send your email or copy out of the TO box to a Word document or excel to save the distribution list. Be sure to check that the list of email addresses did not get cut off. Outlook may have a limit of 100 email addresses, so be sure to check that the last one on the report did make it though to Outlook. If it did not, then find a way to subtotal your report on batches smaller than the maximum which will populate to Outlook and do it in two chunks.
