How do I delete someone else's ID account in my App's on my Mac?

I didn't suggest you delete the App Store application. I suggested you delete the app you downloaded from the App Store, "Pinprick" or "Pincushion" or whatever it's called.

I think you'd be better off making a "Genius" appointment at an Apple Store so someone can help you in person. I'm failing miserably to make myself clear to you.

Okay, so what if ALL of these suggestions fail? I have followed every idea given in this entire thread, and App Store STILL wants to "update" some App, registered to some other user ID (e-mail address) for which I have no password. There is not only no such app on my system, there is no evidence of any such app anywhere - no preferences file for it, nothing, not even one for another app by the same company. It's just WILL NOT go away, no matter what I do. It makes me want to just trash App Store itself since it pesters me with reminders to "udpate" this ghost application. The app is cheap enough, but I can't just buy it myself, since it always want to "update" that which is not even here in the first place.

Nevermind. Found it on another site:

If there is no evidence anywhere on your system of the offending app, you have pirated software on your system (whether you installed it or not - no accusation intended) in which someone put their own Apple Store "receipt" file from a valid app into one they didn't pay for to trick the system into thinking it was paid for. The way to track this down:

A) Launch the Terminal.

B) Type: "locate _MASReceipt/" (without the quotation marks) and press Return (Enter).

C) That gives you a list of installed apps that came from, or have been faked to appear to have come from, the Apple Store. Compare this list to the list in the Apple Store application under Purchases.

D) Make a short list of those which appear in the "locate" list but not the real App Store list; in the App Store application, select Store -> Sign In, login with that, then pick Store -> View My Account, then (after App Store makes you login again for no reason) select View Hidden Purchases, and eliminate any apps that appear here from your short list of suspect apps.

E) If your suspects list is just one app, trash that and reboot.

F) Otherwise open (in a text editor) the receipt file in the _MASReceipt folder inside the application bundle (e.g. /Applications/FooBarBazQuux.app/Contents/_MASReceipt/receipt) of each suspect app in turn, and look for text strings, such as an app name, publisher name, user ID, or other telltale content that has something to do with the app you can't update or get rid of and nothing to do with the app in which you found that receipt file. When you find the culprit app, trash it and reboot.

Hi SMcCandlish,

I did what you said but I got the WARNING:

-------

WARNING: The locate database (/var/db/locate.database) does not exist.

To create the database, run the following command:

sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist

Please be aware that the database can take some time to generate; once

the database has been created, this message will no longer appear.

-----

What to do then? I have this exact same problem with an Angry Birds. I click on UPDATE and it shows some Russian email from an Account I have no idea whos is...

FTR its my MAC for like 4 years, bought new, no IDs appart from mine.

Ty for the help!

Hi IamCorvenDallas

I have exactly the same problem as you. This MASReceipt file does't exist, and my app store keeps telling me to update Angry Birds. I get the same message as you when I run the command on Terminal. Did you manage to solve this?

Thanks!