Windows Live Mail groups
My friend has Windows Live Mail (latest version) running on Windows 8. He has two groups, or categories as they call them in WLM, that he created for sending out mail. One group works fine, but the second one has a problem. When he selects it, it shows up in the To: field, but when he goes to send it, WLM says he needs to put a valid email address in the To: field. I've checked and all the entries in the group have valid email addresses, and the group seems to be set up the same way as the group that does work.
what do you mean by "groups, or categories"?
Are you referring to groups of contacts?
WLM uses a Categories terminology rather than a Group. You would open your contacts and choose Category, then name the Category and add whatever contacts you wish to have in that Category, thus allowing you to just add the Category in the Send To: field rather than all the individual contacts. When sent, the Category expands to allow a sender to see all the contacts in the Send To: field. I hope this explains the Categories appropriately.
In the OP's case I would delete the Category that is not working and create the Category again. It is possible something untoward happened when the Category was first created.
If this does not work, save the Windows Live Mail folder (Users, "User Name", Windows Live Mail) Store Folder, then uninstall/reinstall Windows Live Mail, then move the save Store Folder back into the proper place to replace the new Store Folder.
OK, then I will plan to go over to his house this week and recreate the Category.