Error while preparing to send sharing message in MS Office

Madalina Dinita
by Madalina Dinita
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  • Error while preparing to send sharing message sometimes appear in Outlook when you try to share your Calendar.
  • Some corrupt files might be the cause, so make sure to go through the solutions below and try to fix the error.
  • So although being one of the widely used email clients, Outlook is not free of errors.
  • However, you'll surely find everything you'd like to know about using or fixing this app in our Outlook Guides Hub.
error while preparing to send sharing message

Most Microsoft users are experiencing the Error while preparing to send sharing message in MS Office when they try to share the Calendar.

This error is also common with Microsoft Outlook 2007, Outlook 2010, and Outlook 2016. Today we’ll try to fix this error once and for all.

Causes of Error while preparing to send sharing message

  • Office file corruption – Some Office files create a link between Outlook and your Calendar app. These files can get corrupted leading to this error message.
  • Add-ins meddling with the sharing option – Installing an outdated or an experimental add-in for Outlook can lead to this issue.
  • When permission of the Calendar folder is destroyed – this factor is common on Windows 10. This occurs when an entry known as PR_MEMBER_NAME is displayed as duplicated.

How can I fix Error while preparing to send sharing message?

  1. Uninstall and reinstall the Office suite
  2. Try to repair Office
  3. Remove interfering add-ins
  4. Use the Calendar permission button
  5. Delete all Outlook login details

1. Uninstall and reinstall the Office suite

  1. Open the Run window, type appwiz.cpl and press OK for Program and Features to open up.

appwiz Error while preparing to send sharing message

  1. Locate Microsoft Office on the list.
    uninstall or change a program error while preparing
  2. Right-click on the Microsoft Office and click on Uninstall. Then, follow the prompts to uninstall the application from your computer.
  3. Once the application is removed, install it again and check if the issue is still there.

Alternatively, you can use uninstaller software such as Revo Uninstaller to completely remove Microsoft Office from your PC.

Revo is extremely efficient in removing leftover files,  folders, and/or Registry entries from unwanted programs. Besides uninstalling the program, Revo also scans for whatever trances of the respective app are left in the system to leave it clean before a re-install.

So with the help of Revo, you clean your PC from whatever old Outlook-related file, to make sure that these won’t interfere with the fresh Outlook version or with the installation process.

Revo Uninstaller

Revo Uninstaller

Use this tool to uninstall Outlook completely and get your PC ready for a clean install of the same program.
Get it free Visit website

2. Try to repair Office

You could try to repair Outlook using a  third-party repair tool that specializes in the Microsoft Office Suite – Stellar Toolkit for File Repair.

The software includes a combination of apps that resolve all types of file corruption issues in MS Office application documents. No matter the Office component you have trouble with, this tool will immediately and efficiently fix the issues.

It is compatible with the latest Office suite, but also with older versions, stating with Office 2000.

Stellar Toolkit for File Repair

Stellar Toolkit for File Repair

Fix your Microsoft Office issues in just a few minutes with the help of this all-inclusive repair tool.
Try it free Visit website

3. Remove interfering add-ins

  1. Press Windows key + R. Type outlook.exe/safe, press Enter so as to launch Microsoft Outlook in Safe Mode. At this point, the program will start running with only the necessary modules. Add-ins and other components will not be allowed to start.

Error while preparing to send sharing message run outlook

  1. Try to send a calendar invite from the program. If it is successful, then it indicates that one of your add-ins is causing the error message.
  2. Close Outlook and start it normally this time.
  3. In Microsoft Outlook, select Options.
  4. In the Options menu, select the Add-in in the right window. Scroll to the bottom of the screen and from the drop-down select the COM Add-ins and press the Go button.
  5. Remove checkmarks for all add-ins. Then add them back one after the other while trying to send the Calendar invites till you are able to detect the add-in that is the cause of the error message.
  6. After detecting the add-in, select it and remove it from the COM Add-ins window.
  7. Now, restart Outlook and check if the issue is still there. However, if this does not work for you, move on to the next solution.

4. Use the Calendar permission buttonchange calendar permissions office

  1. Click on the Calendar Permission and make use of the option to allow access to other users.
  2. After that, you can click on Add on the menu and allow Calendar Permission to other users. They would be able to get an invitation through email.

This particular solution is just a workaround and not a permanent fix to the Error while preparing to send sharing message in MS Office.


5. Delete all Outlook login details

  1. Press Windows Key + R, a dialogue box will pop up. Now, paste or type control/name Microsoft.CredentialManager. This command will open up the Credential Manager.run credential manager Error while preparing to send sharing message in MS office
  2. In the Manage your credentials, select Windows Credentials.
    windows credentials Error while preparing to send sharing message in MS office
  3. Browse through to Generic Credentials and erase every record that mentions Outlook, Exchange or Office.
  4. Once every entry has been deleted, exit the Credential Manager and reboot your system.
  5. Now launch Outlook and you should be able to log in without any difficulty or error message displayed.

So these are some of the solutions that might help you fix Error while preparing to send sharing message in MS Office, so be sure to try them all.

We’d like to hear from you, so you can tell us which solution worked. Feel free to use the comments section below.

Editor’s Note: This post was originally published in April 2019 and was revamped and updated in July 2020 for freshness, accuracy, and comprehensiveness.