Outlook client giving error when replying or forwarding email chain, with or without attachment and getting an error: “This is not a valid file name”. The issue could be local outlook setting, plugin as well links, or images broken. The best way to check via Web outlook is to test your issue, if the web works then look at the settings of outlook. Here are some options that may help fix your issues.
Look at the body of the email:
Look at all links and empty areas of the body to see if there are any hidden links, Like the example below
Once removed any broken links, your issue should be fixed
Also, you can try converting the HTML to Plain Text, which will remove all formatting and links
Check outlook in Safe mode:
Click Start > Run.
Type Outlook /safe, and choose OK
Take a look at the Plugin of outlook:
You can get to it by going to File>Options>Add-ins
Just uncheck to disable whichever you don’t use or causing the issue
Getting errors when trying to open an attachment from Outlook something like “cannot save the attachment. Cannot create file: FileName.pdf. Right-click the folder you want to create the file in, and then click Properties on the shortcut menu to check your permissions for the folder.” This may be due to permission or a corrupted temp directory. Here is how to fix it, one thing you could try without doing anything is to restart the computer, if that does not fix try the following options.
Option 1: rename temp folder
The temp folder of outlook is located at the following location: “YourUserName” which would be your own user name, anything after Content.Outlook\ would be randomly created folder name by an Outlook
Make sure your Outlook is closed, then rename to old or anything you want or simply delete it. Then re-open the outlook, it should recreate the temp folder and your attachment should be fixed
Then change the OutlookSecureTempFolder location to somewhere you have access. Remember this is the default location, if you do change the custom, and when an update applies it may revert. When you open the outlook it should work now, you should see new random folder after your default location.
There is a number of ways to change the view and options you can choose from. Most common is having to be able to view these headers so you can sort them, they are From, Subject, Received, Size and Attachments
Based on the size of the screen you might only see this, which means you can need to change size or decrease the Characters from default 125 to like 75 or whichever works for you.
Screenshots are from Outlook 365, but other versions have similar settings too
You can change by going into View>View Settings>Other Settings…>under Other Options
If you like you can add other columns which you like too, it’s all customizable, if you changed something and you don’t like you can Reset the view to default by going to View>Reset View
Most if not all businesses use Outlook for their email and there are many versions of it. Outlook supports many types of email account and they all have many settings. It varies on requirements for the Outlook version if it supports it or not. Microsoft office 365 does not support Outlook version 2007 and older, note Outlook 2010 still supports with SP2 but will also stop supporting by next October 13, 2020, here is a link for more info.
A quick checklist of possible issues:
Access/Password make sure you have access to the account and password is correct
An account may be locked, make sure it’s not locked by admin or Microsoft or your email provider
Firewall, make sure your device or network you are connected is not blocking
Settings, if you are setting up manually make sure protocol and ports are correct
Updates, make sure there are no pending updates or service patches that required by an email provider
Make sure Auto discovery URL is correct
Make sure your account is allowed to sign in and use the apps. Also, check your user/password in case there is any typo.
Outlook 2013, 2010 version:
Setting up profile go to Control Panel and click on Mail (if you don’t see the mail you can search it or change the view) then click on Show Profiles
You may have more than one profile, so you can select the “Prompt for a profile to be used” so when you click on outlook it will ask you to select the profile if it’s only one profile you can select “Always use this profile”
Filling your login info and clicking Next will fix the issue about Exchange is unavailable.
You should see something like this if everything goes well. If you get password screen pop up you may have typed the wrong password or your account might be locked.
If you have selected to set up manually and may get this message, which could mean the settings don’t match or your account can’t be found, don’t have the right to the account.
That’s it, if you still have issues make sure your Outlook meets the requirements, you may need to install updates that your computer may not have yet. Or you may need to do the repair of the outlook or whole Office suite to fix any corrupted system file. You can test your connection with office 365 https://testconnectivity.microsoft.com/ Also, you may want to double-check your domain settings on your office 365 admin portal: https://admin.microsoft.com/AdminPortal/Home#/Domains