In Outlook email have used folders forever. Have 2 main folders: 1 for work, 1 for personal. Many subfolders (eg 100)
Can see the benefit of categories (tags) as can associate an email item with >1 category.
Have started using tags in other software: Evernote/internet browser/RSS feeds/financial program. Evernote has been my 1st software storing data where I have simplified folders (only 2..personal and work), and emphasized tags.
Also (separately from Outlook) have many files on Windows PC: My documents eg MS word/Excel/notepad etc. These are in folders. Is there any way to "tag" these items?
I like using folders for bookmarks in a browser. Simple to open multiple sites simultaneously eg "weekday morning-home" or "weekday-arrive at work".
Main decision right now is how to organize email in Outlook. I also use a Blackberry, and it does not appear that Outlook categories are shown for email on the Blackberry (they are for tasks). I guess that's not a huge deal, as there are other ways to search for emails on the Blackberry.
I'd like to have some standardization of tags/folders across different platforms to simplify life.