Can't move mail items from one PST to another in POP3 Outlook 2013.

Open Both PST files.   Then in one, use the Move Icon to move to the Other file. Be sure you choose the other file. You can do this. I have done it a while back, but both files (PST files) must be open.

I've already got Outlook opening up the default PST and the archive PST at startup--is that what you mean by "open both PST files"?  

When I right-click on a problematic email and use the Move command to try to send it to the archive PST, I get a notification that says "Microsoft Outlook could not complete the operation.  One or more parameter values are not valid."

Look in Outlook, Left Side folder tree.

Do you see both Main Outlook and Archive both?

Try to open a folder in Archive. Can you do this?

It could be the original email item is damaged.

I do have both the primary PST and the archive PST visible in the left-hand pane in Outlook.  I can browse to any folder under either PST.  I can create subfolders in either PST, and I can move the problematic emails around between the folders as long as I stay within the same PST.  The problem arises when trying to move the problematic emails to another PST.  

The problematic emails are tied to two specific users.  For example, in the Sent Items folder, any emails that were sent to problem_email1@server.com or problem_email2@server.com cannot be moved to the archive PST.  (As far as I have found, there are only two recipient email addresses that are affected.)  But emails that were sent to any other email address can be moved no problem.  It's like emails sent to either of those two email addresses were somehow flagged or modified, preventing them from being moved.

I do not believe it is an issue with the original emails being damaged, as it is very specific about affecting just ones sent to certain email addresses.  Additionally, I have run ScanPST on the original PST several times, and while errors were found during the first couple of passes, subsequent passes come back clean.

UPDATE--apparently the issue affects more than just problem_email1@server.com or problem_email2@server.com--while attempting to copy, I have discovered that there are sometimes several emails next to each other in chronological order in the Sent Items folder that cannot be moved.

Can you repair their mailbox file?  That appears to be the source of the error

I've repeatedly run ScanPST until it indicates that no errors are found, and then I run it again to confirm that there are still no errors.  No change.

I am not sure what else as there seems to be an error in the mail file if you cannot move some items.

Can you just not move these particular items?

The problem is that the archive process terminates as soon as it gets to one of the problematic emails, necessitating the archive to be done manually.  And if there are a bunch of problematic emails, the process gets tedious and time-consuming.  

I even tried creating a new primary PST and importing the previous primary PST into it--that also failed with the same error as noted above.

Is the Archive File (PST) in the SAME folder as the Main Outlook PST file?
Can you open ANY mail at all in the Archive File?
Can you move a mail in the Main file to another folder in the Main file?

The archive PST is in the same folder as the primary PST.  (I have tried this with the PSTs being located on the user's workstation, and with them on the server.)

Everything in the archive PST is fully accessible and can be relocated within and without the PST.

Anything in the primary PST can be moved to another folder within the same PST, including the problematic emails.

It may be, given your last post, an error in Outlook.

Make sure you have your PST files secure, that you know how to make your email accounts, then uninstall Office, delete the Outlook profile, restart the computer, install Office, update and then test again.

I've already effectively done that--my initial troubleshooting was done using Outlook 2013 on the user's workstation.  The user couldn't have me continue to tie up his computer for hours while I waited for it to scan an 18GB PST, so I continued troubleshooting on the server itself using Outlook 2010.  The symptoms are the same at either location.  

My gut feeling is that there is some kind of flag assigned to some of these emails that's preventing them from being moved outside the PST.  I found an article suggesting that the issue could be due to a corrupted list of suggested contacts (which would seem to make sense because the problem only affects certain recipient email addresses) but deleting the suggested contacts address book had no effect.

I ran a trial of a program called PST Recovery, and it works.  It allows me to export the troublesome emails from the primary PST (the program creates a fresh PST), and after that is completed, I can then drag-and-drop those formerly-troublesome emails into any folder within or without that PST.  It's $50, but I've spent enough time messing with this that it's worth it.  https://www.pstrecovery.net/purchase.html  

That said, I'm still willing to award points if a solution can be found that doesn't involve a third-party paid piece of software.

You can also try a trial of Stellar Tools.  (www.stellarinfo.com).  It is not free, but the trial may work for you.

You have run SCANPST and that did not fix the issue.

So now you are into paid tools.

One last thing to try:

Open Outlook, Options, Advanced (?), Auto Archive.  

Create a New Archive file (use the selection where you select the archive file). Make a new one, do an Archive Now, and see if you can get some data in the new Archive file.

Now:  

1. Can you move from the PST to the new Archive?  
2. Can you move from the old Archive to the new Archive?

I ran an auto-archive of the corrupted PST to a new archive PST.  It failed with "error while archiving folder *inbox* in store *CM corrupted_inbox_items*.  Some items cannot be copied.  They were either moved or deleted, or access was denied.  Of the 47 items in the source PST Inbox, 30 of them were copied (but not moved) to the archive PST.  I tried manually copying / moving the remaining items and they all returned the same error message.  

I then tried moving items from the existing archive PST to the new archive PST, and was able to do so successfully.  

The conclusion seems to be that corrupted emails just can't be moved by dragging-and-dropping in Outlook, and that only some of them can be moved by archiving, but that the archive process doesn't remove the emails from the source like it should.  

I ended up using the PST Recovery software that I had linked above, and it got just about everything fixed, relocated, and accessible in the new archive PSTs.  Everything that it got moved that was previously troublesome is now able to be moved normally.  There were a few remnants, which are what I left in the *CM corrupted_inbox_items* PST and used for testing your last suggestion.