I haven't purchased it - and I probably won't! Like I said above, I already have a few too many in this category!!
Oh! I should have also mentioned Pierre Paul Landry's ambitious undertaking, InfoQube (formerly SQLNotes). That is a PIM in the true sense of the word, though like most I don’t believe it has - or will have in the foreseeable future - mobile versions available. Still it definitely deserves a good, hard look.
daddydave, I must add to your definition of a PIM as far as many users are concerned: A PIM should also have the ability to store any and all data that you consider important, and to make it easily retrieved when needed. Several of the users over on outlinersoftware.com use PIMs to manage their Windows files and folders; to collect and store all their research including web pages, entire web sites, bookmarks, papers, essays, articles, etc. Forexample, if Ultra Recall, InfoSelect, and the rest only handled tasks, calendar, contacts, and notes, they wouldn’t be in business very long! The term (acronym) PIM, for Personal Information Manager, at one time did pretty much cover only those four points you mentioned. In the last several years however PIM has been expanded to also cover a heck of a lot of other information that is important to the user.
Here's a decent thread that tries to distinguish between what many of the folks over at outlinersoftware.com consider to be outliners vs. "personal knowledge systems". (Many attempts at delineating between the specific terms of "outliner" and PIM):
http://www.outlinersoftware.com/topics/viewt/1522Thanks!
Jim