wanted software feature

– for gmail to have ‘read within the last 24 hours’ as one of its categories. If I read an email message on my cell phone, the message loses its ‘unread’ status, but I might want to remember to view it again when I’m at my computer. If this category exists, then I can simply routinely check it every time I check my email and catch an already-read email message that I wanted to look at again but might (sooner or later WILL) forget to do so because without this category it will have slipped over the horizon, being subject to the ‘out of sight, out of mind’ syndrome.
keywords:
[cyberspace]
[user-friendliness]
[user friendliness]
[Information Technology (IT)]
[user-interface]
[user interface]