Office 365 Activation not valid
Office 365 buttonWhen you have an Office 365 license and start Outlook or any other of the Office applications for the first time after the upgrade, you may be prompted to log on with your Microsoft Account again to re-activate your installation or receive a warning that your license is no longer valid.
In case of the last, the solution to this annoying issue is luckily easy and fixed within minutes; Run a Quick Repair on your Office installation.
To do this, make sure all your Office applications are closed, open Control Panel-> Programs and Features-> select your Office application-> button Change-> option Quick Repair.
Add-Ins buttonIf you are using any add-ins with Outlook, make sure they are also compatible with Windows 10. You’ll probably find that most of them are compatible as Windows 10 is in that aspect similar to Windows Vista, Windows 7 and Windows 8 and most of the compatibility requirements for add-ins are coming from Outlook and not from Windows.
Still, since add-ins are not limited to operate just within Outlook and with Outlook data, it is a good thing to check with the vendor of the add-in first.
If you are having startup issues with Outlook after upgrading, disabling your add-ins would be a good first troubleshooting step.
Virus scanner integration
Windows Defender buttonEven though Windows 10 has its own virus scanner in the form of Windows Defender, you might opt to install a 3rd party virus scanner instead. When installing your virus scanner, make sure you do not install any Outlook integration components. This is not specific to Windows 10 or any Outlook version but a general best practice for Outlook.
There are many known issues caused by having a virus scanner integrated with Outlook. These issues range from poor Outlook performance to send receive errors and from corrupted emails to complete data loss.
You can safely disable this integration part of your virus scanner without compromising your security; you’d still be sufficiently protected by your on-access scanner part of the virus
Send/Receive error: 0x800CCC13
Send/Receive Broken buttonWhen you try to send a message, you could receive the following error:
Error message: ‘Robert – Sending’ reported error (0x800CCC13): ‘Cannot connect to the network. Verify your network connection or modem’
While the exact cause for this issue is unknown, to fix it you must run “sfc /scannow” from an elevated Command Prompt and reboot your computer afterwards;
Right click on the Start button of Windows and choose: Command Prompt (Admin).
If you don’t see this, instead choose: Windows PowerShell (Admin)
Behind the prompt type: sfc /scannow
(note the space in the command)
Wait until the process completes. This usually doesn’t take longer than 20 minutes with a regular hard disk and takes much shorter when you have a fast SSD drive.
Restart your computer.
PST File access is denied
PST Access Denied buttonUpon starting Outlook, you may receive the following error message:
Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. File access is denied. You do not have the permission required to access the file
In that case, you’ll need to adjust the file permissions for the pst-file that is referenced and grant yourself “Full Control” permissions.
Browse to the file location as indicated in the error.
Right click on the file and choose Properties.
Select the Security tab.
Press the Edit… button.
Select your user account.
Select the “Full control” permission.
Press OK until all dialogs are closed.
Start Outlook again.
Permissions for Robert.pst – Full control
Give yourself Full Control to your pst-file.
When you are suffering from this issue, it may be wise to reset the permissions for your entire user folder. For detailed steps how to do that see: PST File access is denied after upgrading to Windows 10
iCloud doesn’t work
iCloud buttonDo you have the iCloud add-in installed? It may not work anymore after upgrading to Windows 10. To solve this, remove iCloud from your mail profile, repair the iCloud installation and then re-add the iCloud configuration to Outlook again via iCloud Control Panel.
File-> Account Settings-> Account Settings…-> tab Data Files
Select the iCloud data file and press Remove.
If you also connected to the iCloud account via IMAP, remove this account.
Make sure you export all the content that is stored in folders that are marked with “This computer only”.
Open the iCloud Control Panel via the Start Menu and uncheck the option: Mail, Contacts, Calendars, and Task with Outlook.
Download and install the latest version of iCloud from the Apple website.
When you already have the latest version installed, choose the Repair option.
Reboot when being prompted to do so by the iCloud installer.
Open the iCloud Control Panel via the Start Menu and select the option: Mail, Contacts, Calendars, and Task with Outlook.
If this is a new installation of iCloud, iCloud may prompt you to run a repair on the iCloud installation again and reboot. Outlook integration will be available then as long as your are not using Outlook 2016 Preview.
Start Outlook and let iCloud resync your data.
No new email notifications
Action Center buttonIf you no longer get any New Email Notifications, then click on the Action Center icon in the bottom right corner of your Taskbar to see your past notifications including emails from Outlook 2013 or Outlook 2016.
To get the New Email Notification banner again for each email that you receive;
In the Action Center click on All Settings or click on Settings in the Start Menu instead.
Click on: System.
From the panel on the left select: Notifications & Actions.
In the “Show notifications from these apps” section at the bottom, click on Outlook.
Make sure that you have enabled all notification options.
Notification Settings for Outlook 2013 in Windows 10.
Notification Settings for Outlook 2013 in Windows 10.
Outlook will only show New Email Alert when the message is delivered to the Inbox folder. To make it show an alert even when the message is automatically moved to another folder by a Message Rule see the guide Creating a permanent New Mail Desktop Alert.
Rebuild search index / no search results
Search Outlook buttonAfter the upgrade to Windows 10 has finished, you might notice that no search results are being returned when you use the Search field in Outlook.
The first solution to this is: Wait!
In most cases, Windows Search still needs to re-index your Outlook content (and the rest of your computer) and will fix itself eventually when the computer is idle.
If results are still not being returned after you’ve left your computer idle for an extended period of time (like for instance overnight), then you can use the following troubleshooting guide: Fixing Instant Search
Pictures not showing and “Work file” error
Broken Pictures buttonAfter upgrading, you might encounter an issue where pictures from the Internet might not be downloading into the message or that you get an error which reads;
Outlook could not create the work file. Check the TEMP environment variable.
Solving this issue is 2-fold and requires editing the Registry;
Reset the registry value for the location of the “Temporary Internet Files” folder to default.
Delete the registry entry for the “SecureTempFolder” in Outlook
The Registry entry for the Temporary Internet Files folder can be found here;
Value name: HKEY_CURRENT_USER\Software\Microsoft\Windows\Current Version\Explorer\User Shell Folders
Key name: Cache
Value type: REG_EXPAND_SZ
Here, verify that the location for that key is set to;
%USERPROFILE%\AppData\Local\Microsoft\Windows\Temporary Internet Files
Outlook uses a subfolder in the Temporary Internet Files folder to write its temp files which are retrieved from the Internet. For instance; linked pictures and attachments. To make sure a proper folder is being created, we reset the reference to this folder so that Outlook will recreate the registry entry and folder automatically the next time is needs to be used.
Value name: HKEY_CURRENT_USER\Software\Microsoft\Office\
Key name: OutlookSecureTempFolder
Value type: REG_SZ
Delete the key name. If the key name is not there, you’re ok already.
Now restart your computer for the changes to take effect and try again.
For more information about the SecureTempFolder for Outlook see the guide:
Error opening attachments / Cleaning out the Temporary Outlook Files folder.
Scan for and fix more issues with OffCAT
OffCAT buttonIf you are still having issues now, or even if you haven’t, use the Microsoft Office Configuration Analyzer Tool (OffCAT) to scan your Office configuration for any known issues that can cause problems.
After the scan completes, OffCAT provides a detailed report of your installed Office programs. For any problems that are listed in the report, you are provided a link to an article about that specific problem so that you can read about possible fixes.
OffCat may also find some issues that you didn’t know about yet and/or already had before upgrading to Windows 10.
Download: Microsoft Office Configuration Analyzer Tool
View: Office Configuration Analyzer Tool (OffCAT) information
Clean install or upgrade has failed
Windows 10 – Clean installDid the upgrade fail and/or do you want to do a clean install of Windows 10 on a new or formatted disk?
During the setup process, when being prompted for what to keep, choose for the “Nothing” option. Of course, this means that you need to have a backup of all data that you wish to keep and restore that afterwards.
You can also download the Download Windows 10 to create a bootable USB-based installation media or burn to a DVD and boot your computer with.