I did write this article but it is the best article to write about this common problem.
When opening an attachment directly from within Outlook you could get an error message saying that it can’t create the file and to that, you need to check the permissions on the folder you want to save it in. In most cases, the permissions on the folder aren’t the issue but the fact that the folder is “full”. When you open an attachment directly from within Outlook it will first save a copy to a subfolder of the Temporary Internet Files folder.
Cleaning out the folder will solve the issue.
Outlook Secure Temp folder
Unfortunately, this is easier said than done. The subfolder name Outlook creates (on the installation of Outlook) in the Temporary Internet Files folder is quite random.
In Outlook 2003 and previous, the name starts with OLK and is followed by up to 4 random numbers or letters. In Outlook 2007, 2010 and 2013, this folder is called Content. Outlook and then has a subfolder which is named with 8 random numbers and letters.
In addition, by default, you cannot simply browse to the folder to clean it out. Getting to the Temporary Outlook Folder can still be accomplished in 2 easy steps though.
Step 1: Locate the folder
The folder location is stored in the registry in the following key;
Well, I going to start to finally use this blog; most likely as a journal and to post stuff learned at work. So let’s get started. I didn’t write this article, it was written May 11, 2012, by Joseph Hanna. This is a common problem that has a popped up with my end users and clients using Microsoft Outlook especially from using Google Apps as the email provider.
Otaku IT Guy!
Having many folders with many messages in Microsoft Outlook, especially if they have attachments, can be slow. This issue is because Microsoft Outlook downloads all messages every time including attachments versus a normal email IMAP application where only headers are synced to present crucial information only, and messages and attachments are ONLY downloaded and cached upon viewing the message or if the mail application is explicitly told to download all messages. Remedy this situation as follows:
After setting up your IMAP email account in outlook, right click on your email account and select “IMAP Folders…”
Click on the “Subscribed” tab and click the “Query” button.
Select all items in the list as follow:
Select the first item in the list and scroll all the way down.
Hold shift and click the last item in the list.
Click the “Unsubscribe” button.
It may prompt about folders that cannot be unsubscribed, just click “OK” here.
Select the “All” tab as we are now going to sync folders we wish or need to sync.
Select “Drafts” and click subscribe.
Select “Inbox” and click subscribe.
Select “Junk” and click subscribe.
Select “Sent” and click subscribe.
Select “Templates” and click subscribe.
Select “Trash” and click subscribe.
Do this for any other folders you wish to sync with the server.
Uncheck the option “When displaying hierarchy in Outlook, show only subscribed folders.” at the bottom of the window.
Click “OK” to close the window and commit the options.
This will resolve extremely slow synchronizations with Microsoft Outlook platforms. This issue can still be noticed if you have a very large Inbox folder, Sent folder, Trash folder, or any subscribed folder. The recommended method of avoiding this outlook issue is to simply file away messages from these subscribed folders into archived/unsubscribed folders (this also keeps your email organized!). Also, you can simply archive messages in outlook to clean them out of your mailbox (be careful as this WILL remove the messages from the server). Lastly, be sure to empty the Trash folder frequently enough to avoid a constantly growing Trash folder.