This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
This just started happening. Whenever I open Outlook, I get the message "Outlook closed while you had items open. Reopen items from last session?" even though this is not true -- I did not have items open when I closed Outlook. Using Windows 11. Screenshot of what version of Outlook I have:
Using classic Outlook for Windows in business environments
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
I'm on build 2306. Is this the reg key in question?
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences
DWORD: ReopenWindowsOption
Value: 1
Yes.
Some users that updated to 2306 have reported that the key was not already in the Registry and had to add it and the value.
Microsoft® Outlook® 2021 MSO (Version 2309 Build 16.0.16827.20130) 64-bit, & Windows 11 Home 22H2
Hi Ted William Hassing:
Just a hint for future reference. When you report your MS Office version and build in forums be sure to use the version information displayed at File | Office Account beside the About Outlook / About Excel / About Word buttons as shown below. This is the version and build number used in the release history for retail versions of MS Office 2021 at https://learn.microsoft.com/en-us/officeupdates/update-history-office-2021#retail-versions-of-office-2021 and the release notes for the Current Channel release channel at https://learn.microsoft.com/en-us/officeupdates/current-channel.
I don't know why, but when you click the About Outlook / About Excel / About Word buttons the build number shown in the pop-up window does not always match the "correct" build number displayed beside the button. For example, here's an old image I captured on 04-May-2022 showing a mismatch in build numbers for Version 2204 (Build 15128.20178).
Dell Inspiron 5584 * 64-bit Win 10 Pro v22H2 build 19045.3448 * Firefox v118.0.1 * Microsoft Defender v4.18.23080.2006-1.1.23080.2005 * Malwarebytes Premium v4.6.3.282-1.0.2158 * Macrium Reflect Free v8.0.7279 * MS Office Home and Business Version 2309 / Build 16827.20130 Click-to-Run
Did al that, error still remained after that but then magically a fix occurred!
Microsoft® Outlook® 2021 MSO (Version 2309 Build 16.0.16827.20130) 64-bit, & Windows 11 Home 22H2
I do not have the start-up options giving me any selections...
Hi FeliceWerwin:
What is your Windows operating system and the name of your Microsoft Office Click-to-Run product? When you launch Outlook, go to File | Office Account, and look beside the About Outlook button does it show that you have received the Version 2309 / Build 16827.20130 update released on 28-Sep-2023? If not, go to File | Office Account | Update Options and choose Update Now to start the installation of the latest update with the bug fix.
From File | Office Account of my MS Outlook 2019 that is part of my Microsoft Office Home and Business 2019 Click-to-Run suite:
Dell Inspiron 5584 * 64-bit Win 10 Pro v22H2 build 19045.3448 * Firefox v118.0.1 * Microsoft Defender v4.18.23080.2006-1.1.23080.2005 * Malwarebytes Premium v4.6.3.282-1.0.2158 * Macrium Reflect Free v8.0.7279 * MS Office Home and Business Version 2309 / Build 16827.20130 Click-to-Run