We’d like to share with you how Search works and why the limitation is set on 30 days.
Basically the reason why we have to limit to 30 days for categories is because searching across a large number of feeds takes a long time to return results right now. This also explains why we can remove this limit when you search directly in a feed rather than a category, as that will return search results a lot faster.
You can still see all the older articles as unread in all your Collections/Categories. If you’ll click on the Gear icon on the top right and uncheck “Unread only” you’ll see all the articles, just marked as read.
Improving our search feature is one of our top priorities for feedly Pro, so we’re trying to up this limit soon. Unfortunately we don’t have an ETA to give you on that.Xavier Novella Sinde commented
I have been some days struggling with the marked as unread problem. This is a solution that may be used along with a feed reader:
To make your account a more future-proof archive, remember to untick FTTT'S url shortener in email applet.
You may loose part of precious queued articles, but will be able to start "feeding" your Informational Diogenes without fear to loose them.
If you only want 1 account: Tags, auto-filters, autoarchives (without marking read) are your men.
If you don't care creating a "feed" account: "New" is the word.
PD: If somebody finds a solution to gather all the posts in a feed during 24 hours and send them in 1 daily email, please tell. (News feed like "Die Zeit", "NHK", "Ara.cat" would mean like +45 emails a day each, which is crazy)
Have a nice day,